Do i need to be part of the guild?

Hello everyone,

I am quite new in POE community and I don't understand the purpose of being part of the guild, do I need it, or it is absolutely fine to play alone?

Apart from the community|communication reasons, does anything in the game require you to be part of it?

I am on Act 2 cruel right now, maybe there is something in endgame that I don't know, like raid bosses…