Learn languages. Don’t do it to impress people, but to really learn. Hey native language tutors. Go out and embarrass yourself trying to speak with real people.

This plus maths and music is probably the best exercise for your brain.

Then follow the advice others have posted to keep reading.

It’s more reliable than SMB or CIFS and considerably harder to attack.

This take is absolutely correct.

Assemble a list of MAGAts. Denounce all of them as illegal aliens. At least a few of them will be deported.

Repeat ad infinitum.

It seems that this might be useful to add to this pile of information:

https://meta.discourse.org/t/federation-support-for-discourse/90921