How does the All feed work?
I'm new to Lemmy and trying to understand how the All feed works. Doing some reading it looks like it is populated by communities that people on the instance I'm apart of have join. Is that correct?
All will show you stuff from every community from every Lemmy instance, unlike local which only shows you communities from your local instance.
Not exactly all instances, but all instances federated with and cached by your home instance. (Sometimes it doesn't sync quite right)
Indeed. OP, you are on lemmy.ml, one of the largest instances, so you'll see almost all the content there is on Lemmy.
Someone on a much smaller instance wouldn't see that much.
Also, welcome!
Yes that's correct.
All has posts from all the communities the members on that instance subscribe to.