Edits to FSE documentation

- Cleaned up some of the phrasing
- Added in a few more links
- Made it clear to test with a test site 
- Added context around nav/widgets + the vision for FSE

docs/getting-started/full-site-editing.md

@@ -1,15 +1,19 @@
 # Full Site Editing
 
-Full Site Editing is the umbrella project name for various sub-projects within Gutenberg. Projects under Full Site Editing (FSE) include the Site Editor, Widgets Editor, Navigation Editor, Global Styles, numerous Site/Post/Page specific blocks, Query block, Navigation block, Templates, and block themes.
+At the highest level, the vision of Full Site Editing is to provide a collection of features that bring the familiar experience and extendability of blocks to all parts of your site rather than just post and pages. You can think of Full Site Editing as the umbrella project name for various sub-projects within Gutenberg that make this vision possible. Projects under Full Site Editing (FSE) include the Site Editor, Global Styles, numerous Site/Post/Page specific blocks, Query block, Navigation block, Templates, and block themes. 
 
-**Jump in:** The best way to learn something is start playing with it. So jump in, install the Gutenberg plugin from the plugins directory and then all you need is a block theme. We recommend the [TT1 Blocks theme](https://wordpress.org/themes/tt1-blocks/), it is listed in the theme diretory and our development reference theme. You can find other themes in the directory using the [full-site-editing feature tag](https://wordpress.org/themes/tags/full-site-editing/).
+There are other projects, like the Navigation Editor and Widget Editor, that are meant to specifically help classic themes begin adapting more to the block framework and to act as a stepping stone of sorts to Full Site Editing. These are separate projects from Full Site Editing though but are worth being aware of as they ultimately help the cause of getting more people adjusted to using blocks in more places. 
+
+**Jump in:** 
+
+The best way to learn something is start playing with it. So jump in by installing the Gutenberg plugin from the plugins directory and activating a block theme on a test site. We recommend the [TT1 Blocks theme](https://wordpress.org/themes/tt1-blocks/), it is listed in the theme diretory and our development reference theme. You can find other themes in the directory using the [full-site-editing feature tag](https://wordpress.org/themes/tags/full-site-editing/).
 
 ## Get Involved
 
-An ongoing [FSE Outreach program](https://make.wordpress.org/test/handbook/full-site-editing-outreach-experiment/) is running with calls for testing, this is a great way to get involved and learn about the new features.
+An ongoing [FSE Outreach program](https://make.wordpress.org/test/handbook/full-site-editing-outreach-experiment/) is in place with calls for testing and is a great way to get involved and learn about the new features.
 
-- Join in on Slack at #fse-outreach-experiment
-- Participate in the [Calls for Testing](https://make.wordpress.org/test/tag/fse-testing-call/), test and give feedback.
+- Join in on [WordPress Slack](https://make.wordpress.org/chat/) at [#fse-outreach-experiment](https://wordpress.slack.com/archives/C015GUFFC00) 
+- Participate in the [Calls for Testing](https://make.wordpress.org/test/tag/fse-testing-call/) by testing and giving feedback.
 - See detailed [How to Test FSE instructions](https://make.wordpress.org/test/handbook/full-site-editing-outreach-experiment/how-to-test-fse/) to get setup to test FSE features.
 
 ## Block Themes