diff --git a/.github/problem-matchers/check-directory-tree.json b/.github/problem-matchers/check-directory-tree.json
new file mode 100644
index 0000000000..2944b5f7e6
--- /dev/null
+++ b/.github/problem-matchers/check-directory-tree.json
@@ -0,0 +1,15 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "check-directory-tree",
+            "pattern": [
+              {
+                "regexp": "^(.+?) (.+?) (.*)",
+                "file": 1,
+                "code": 2,
+                "message": 3
+              }
+            ]
+        }
+    ]
+}
diff --git a/.github/problem-matchers/editor-config.json b/.github/problem-matchers/editor-config.json
new file mode 100644
index 0000000000..4e717d9783
--- /dev/null
+++ b/.github/problem-matchers/editor-config.json
@@ -0,0 +1,20 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "editor-config",
+            "pattern": [
+              {
+                "regexp": "^([^\\\\s].*)$",
+                "file": 1
+              },
+              {
+                "regexp": "^\\s+(\\d+):(\\d+)\\s(.+)$",
+                "line": 1,
+                "column": 2,
+                "message": 3,
+                "loop": true
+              }
+            ]
+        }
+    ]
+}
diff --git a/.github/problem-matchers/yaspeller.json b/.github/problem-matchers/yaspeller.json
new file mode 100644
index 0000000000..d12f4078c6
--- /dev/null
+++ b/.github/problem-matchers/yaspeller.json
@@ -0,0 +1,20 @@
+{
+    "problemMatcher": [
+        {
+            "owner": "yaspeller",
+            "pattern": [
+              {
+                "regexp": "^✗\\s(.*)\\s\\d+\\sms$",
+                "file": 1
+              },
+              {
+                "regexp": "^\\d+\\. (.+) \\((\\d+):(\\d+).*$",
+                "message": 1,
+                "line": 2,
+                "column": 3,
+                "loop": true
+              }
+            ]
+        }
+    ]
+}
diff --git a/.github/workflows/book-check-text.yml b/.github/workflows/book-check-text.yml
new file mode 100644
index 0000000000..2556379598
--- /dev/null
+++ b/.github/workflows/book-check-text.yml
@@ -0,0 +1,43 @@
+name: book-check-text
+
+# Only run this when the master branch changes
+on:
+  workflow_dispatch:
+  pull_request:
+
+# This job installs dependencies, build the book, and pushes it to `gh-pages`
+jobs:
+  yaspeller:
+    name: Spell check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Spell check
+        # problem matching breaks loop when it finds unrelated data, so we use reverse grep to clear output
+        run: |
+          echo "::add-matcher::.github/problem-matchers/yaspeller.json"
+          set -o pipefail; npx yaspeller -c .yaspellerrc.json . 2>&1 >/dev/null | grep -v "\-\-\-\-\-" | grep -v "Typos"
+          echo "::remove-matcher owner=yaspeller::"
+
+  editor-config:
+    name: Editor Config check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Editor Config Check
+        # problem matching breaks loop when it finds unrelated data, so we use reverse grep to clear output
+        run: |
+          echo "::add-matcher::.github/problem-matchers/editor-config.json"
+          set -o pipefail; npx eclint check "**/*.md" 2>&1 >/dev/null | grep -v "EditorConfig"
+          echo "::remove-matcher owner=editor-config::"
+
+  direcyory-tree:
+    name: Directory tree check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Directory tree check
+        run: |
+          echo "::add-matcher::.github/problem-matchers/check-directory-tree.json"
+          bash ./tools/check_directory_tree.sh qmlcourseRU
+          echo "::remove-matcher owner=check-directory-tree::"
diff --git a/.yaspellerrc.json b/.yaspellerrc.json
new file mode 100644
index 0000000000..05e357476f
--- /dev/null
+++ b/.yaspellerrc.json
@@ -0,0 +1,195 @@
+{
+    "lang": "ru",
+    "fileExtensions": [
+      ".md"
+    ],
+    "excludeFiles": [
+      ".git",
+      "node_modules"
+    ],
+    "ignoreUppercase": true,
+    "ignoreUrls": true,
+    "ignoreCapitalization": true,
+    "checkYo": true,
+    "ignoreText": [
+      ["– .*\\]", "g"],
+      ["следующие люди:.*", "g"]
+    ],
+    "dictionary": [
+      ".*логин.*",
+      "bootcamp",
+      "HR.*",
+      "Jira",
+      "onboarding",
+      "playbook",
+      "Podlodka",
+      "Rx",
+      "Spotify",
+      "teamlead.*",
+      "vs",
+      "Авито",
+      "автотест.*",
+      "айти",
+      "айтишник.*",
+      "Ана",
+      "антипаттерн.*",
+      "апдейт.*",
+      "апрув.*",
+      "ассессмент",
+      "аутичн.*",
+      "аутсорса.*",
+      "баг.*",
+      "билд.*",
+      "бланшар",
+      "Бреслав.*",
+      "брейншторм.*",
+      "Булдаков.*",
+      "буллет.*",
+      "буллшит.*",
+      "бытовух.*",
+      "бэкграунд.*",
+      "бэкенд.*",
+      "бэклог.*",
+      "валидирова.*",
+      "версионируется",
+      "Версионность",
+      "виральн.*",
+      "воркшоп.*",
+      "волонтерств.*",
+      "гайд.*",
+      "Гандапас",
+      "геймификаци.*",
+      "главред.*",
+      "груминг.*",
+      "Далио",
+      "дейли.*",
+      "Дельгядо",
+      "ДеМарко",
+      "Деминг.*",
+      "демотиваци.*",
+      "демотивирует.*",
+      "демотивирующ.*",
+      "джедайские.*",
+      "джефф",
+      "дэшборд.*",
+      "заассайнь.*",
+      "замылен.*",
+      "Ильяхов.*",
+      "инбокс.*",
+      "инновационн.*",
+      "интранет.*",
+      "Кейнер",
+      "Кови",
+      "коммит.*",
+      "коммитим.*",
+      "коммуницирова.*",
+      "конфиг.*",
+      "корпоративщин.*",
+      "корутин.*",
+      "кроссфункциональн.*",
+      "Ласло",
+      "легаси",
+      "лендинг.*",
+      "Ленсиони",
+      "логир.*",
+      "лонгрид.*",
+      "майндмеп.*",
+      "Мавричева",
+      "Макафи",
+      "МакГрегор.*",
+      "МакКлелланда",
+      "мейнтейнер.*",
+      "мелкофикс.*",
+      "мем.*",
+      "мерж.*",
+      "мидл.*",
+      "микросервис.*",
+      "митап.*",
+      "монитор.*",
+      "мыслетопливо.*",
+      "найм.*",
+      "напоминалк.*",
+      "незадокументированн.*",
+      "неповторени.*",
+      "неоптимально",
+      "несистемно",
+      "нетворкинг.*",
+      "онбординг.*",
+      "опенсорс.*",
+      "операционк.*",
+      "отрефактори.*",
+      "оффер",
+      "переговорк.*",
+      "переиспользуем.*",
+      "перформит.*",
+      "премиальн.*",
+      "присваем.*",
+      "провалидируй.*",
+      "продакт.*",
+      "промо.*",
+      "профстандарт",
+      "ревью.*",
+      "рекрутер.*",
+      "репутационные.*",
+      "ретроспектив.*",
+      "рефакторинг.*",
+      "референс.*",
+      "рефлекси.*",
+      "роадмап.*",
+      "Рэй",
+      "рэнди",
+      "скилл.*",
+      "скрайбинг.*",
+      "скоммуницир.*",
+      "скоммуницируй",
+      "скоуп.*",
+      "скринкаст.*",
+      "смарт",
+      "собеседуем.*",
+      "созвон.*",
+      "стейкхолд.*",
+      "стендап.*",
+      "стиралк.*",
+      "сторипойнт.*",
+      "стрессует",
+      "стриминг.*",
+      "тайминг.*",
+      "телеграм.*",
+      "техбренд.*",
+      "техлид.*",
+      "технобренд.*",
+      "техпиар.*",
+      "техрук.*",
+      "тикет.*",
+      "тимлид.*",
+      "токен.*",
+      "туториал.*",
+      "шторминг.*",
+      "фасилитатор.*",
+      "фасилитац.*",
+      "фейсбук.*",
+      "феррацци",
+      "фидбек",
+      "фич.*",
+      "флипчарт.*",
+      "фреймворк.*",
+      "фронтенд.*",
+      "Феншуй.*",
+      "хакатон.*",
+      "Хофф",
+      "Херси",
+      "холакрат.*",
+      "хотелок",
+      "чартрайтинг.*",
+      "чиксентмихайи",
+      "шорткаты",
+      "Шухарт.*",
+      "Ферацци",
+      "кликабельн.*",
+      "человекочитаем.+",
+      "локал.",
+      "запуш.{1,3}",
+      "мультиязычност.",
+      "контрибьютор.{0,2}"
+    ]
+  }
diff --git a/tools/check_directory_tree.sh b/tools/check_directory_tree.sh
new file mode 100644
index 0000000000..85670d5234
--- /dev/null
+++ b/tools/check_directory_tree.sh
@@ -0,0 +1,55 @@
+HAS_ERROR=0
+
+check_file() {
+  local filepath=$1
+  local has_frontmatter_title=0
+  local has_ending=0
+  local has_beginning=0
+
+  # [[ ! $filepath =~ ^(\.?[A-Za-z0-9-]+\/)+(ru|index|en)\.md$ ]] \
+  #   && echo "$filepath bad_branch_name Check a directory tree, branch should be named only with lowercase letters (a-z), numbers (0-9) and hyphens (-), file should be named as %locale%.md (ru.md, e.g.)" \
+  #   && HAS_ERROR=1
+
+  if grep -q -E '^# .+$' "$filepath"; then
+    # has a markdown first level header in file
+    return
+  fi
+
+  # iterate line by line
+
+  while IFS="" read -r line || [ -n "$line" ]
+  do
+    if [ "$line" = '---' ] && [ "$has_beginning" = 0 ]; then
+      has_beginning=1
+      continue
+    fi
+    if [ "$line" = '---' ] && [ "$has_beginning" = 1 ]; then
+      has_ending=1
+      break
+    fi
+    # check that line has title frontmatter param
+    if [[ $line =~ ^title:.+$ ]]; then
+      has_frontmatter_title=1
+    fi
+  done < "$filepath"
+
+
+  if [ "$has_ending" = 0 ]; then
+    echo "$filepath open_frontmatter_block Check the .md file, you have open frontmatter block (end it with '---')"
+    HAS_ERROR=1
+    return
+  fi
+
+  if [ "$has_frontmatter_title" = 0 ]; then
+    echo "$filepath without_title Check the .md file, it should have frontmatter block with title param or markdown first level header"
+    HAS_ERROR=1
+  fi
+}
+
+IFS=$'\n'; set -f
+for filepath in $(find "$1" -iname '*.md'); do
+    check_file "$filepath"
+done
+unset IFS; set +f
+
+exit $HAS_ERROR