Well I thought so, but the new editor in Reddit sucks. When I select Markdown it erases the post!

Thanks - all fixed.

Emacs is not a text editor but a programming environment. So it can do anything, as long as it is plain text interface.

Great questions:

1. Encryption using PGP
2. Use auto-fill mode 3.Use the TreeMacs package
3. Org mode does bold, italics etc.. Colours in Emacs have semantic meaning and are automated through a theme.
4. Use a note-taking application, such as Denote or Org Roam
5. Org mode can be exported to many formats. Your documents are in plain text, so conversion is trivial. Aesthetic colouring is managed through export templates if you build a website, book etc.
6. Use Org mode

My website Emacs Writing Studio explains most of what you like to achieve.

The scratch buffer in Emacs disappears after shutdown, but there is a package to fix this issue.

GitHub - Fanael/persistent-scratch: Preserve the scratch buffer across Emacs sessions

You can download the full source, create you own version and compile your own. Ut why not simply add CUA mode in your init file?