Hello fellow Redditugee, I found Lemmy Explorer https://lemmyverse.net/communities to be very handy. I like the layout and the search/sort capability. The process I followed to subscribe to communities was to:

• In Lemmy Explorer, click on the community@instance name (eg !maliciouscompliance@lemmy.world), which automagically copies it to the clipboard.
• Then in my home instance (aussie.zone) I clicked on the search icon (magnifying glass) and pasted the details into the search box.
• I then click Next (not search).
• The search will initially show "No Result" while it searched the Fediverse, but then the community will show up (I'm using dark mode so it shows up in green as a link).
• I click on the link to open the community from my home instance and click on the subscribe button. Initially the community may be set to "Subscribe Pending" - I guess it needs to be reviewed. I've also managed to subscribe to Kbin magazines from Lemmy using this process. Note: this is on PC using Firefox

https://federation-checker.vercel.app allows you to check the instances they blocked and were blocked by.

https://lemmyverse.net/communities is probably the best tool communities. Just set your home instance at the top and then just search for what you are interested it.

Use This Tool!

Everyone suggesting browser links but I hope we will get an app that has some proper navigation of all the instances and its communities.

Sort by all > new/top day/hot/ active, subscribe to anything that interests you.

If I'm looking for something specific i type the community into the search and up they pop. Sub to all of them, or most active.

Eventually you'll have a well curated feed for yourself.

If it doesn't exist, create it. (:

Liftoff has a built in search tool. Just search for the community you might be interested in (it matches both title and description), select "communities", and change the sorting to you liking (top (all time) sorts by subscriber count)