guide: start improving SSH remote page

content/docs/sidebar.json

@@ -137,7 +137,7 @@
                 "slug": "aliyun-oss"
               },
               {
-                "label": "SSH",
+                "label": "SSH & SFTP",
                 "slug": "ssh"
               },
               {

content/docs/user-guide/data-management/remote-storage/index.md

@@ -112,7 +112,7 @@ team.
 
 ### Self-hosted / On-premises
 
-- [SSH]; Like `scp`
+- [SSH] & SFTP (like `scp`)
 - [HDFS] & [WebHDFS]
 - [HTTP]
 - [WebDAV]
@@ -125,7 +125,7 @@ team.
 
 ## File systems (local remotes)
 
-<admon type="tip">
+<admon type="info">
 
 Not related to the `--local` option of `dvc remote` and `dvc config`!
 

content/docs/user-guide/data-management/remote-storage/ssh.md

@@ -1,20 +1,34 @@
-# SSH
+# SSH and SFTP
 
 <!--
 ## SSH
 -->
 
+[SSH] (Secure Shell) is a protocol to connect to a remote computer, which lets
+you transfer files to and from a remote machine using encryption (like [`scp`])
+among other features. DVC will act as an SSH client (like [`ssh`]) which means
+that the remote storage should be in an [SSH server]. The credentials to
+establish the connection (username, password or private key, etc.) are usually
+set in [SSH configuration]; SSH remotes in DVC accept the same values.
+
+[SSH]: https://www.ssh.com/academy/ssh
+[`scp`]: https://www.ssh.com/academy/ssh/scp
+[`ssh`]: https://www.ssh.com/academy/ssh/command
+[ssh server]: https://www.ssh.com/academy/ssh/server
+[ssh configuration]: https://www.ssh.com/academy/ssh/config
+
 Start with `dvc remote add` to define the remote:
 
 ```cli
 $ dvc remote add -d myremote ssh://[email protected]/path
 ```
 
-⚠️ DVC requires both SSH and SFTP access to work with remote SSH locations.
-Check that you can connect both ways with tools like `ssh` and `sftp`
-(GNU/Linux).
+<admon type="warn">
+
+DVC requires both SSH and SFTP access to work with remote SSH locations. Check
+that you can connect both ways with tools like `ssh` and `sftp` (GNU/Linux).
 
-> Note that the server's SFTP root might differ from its physical root (`/`).
+</admon>
 
 ## Configuration parameters