Free, foolproof, safe and quick way to do it is Tailscale.

Using their desktop client is a solution.

Memos, Benotes and BookStack come to mind. Note taking and Bookmarks and link sharing by the wonderful people at awesome-selfhosted might help you find exactly what you need.

If that's a screenshot from your docker host, none. Your wordpress docker image uses it's own config file, which may or may not be easily reconfigurable. Check the documentation.