A question, I just started with my autoflowering but I've seen that it's better to plant it in the final pot. It's a couple of days old and I don't know if I should wait for it to grow a bit or transplant it now while it's small.

Yo growmie, with autos I’d transplant her now into the final pot before the roots start circling in that small container. At this stage she’s still tiny, so the stress is minimal if you do it carefully. Just move the whole soil plug gently and avoid soaking the medium too much before transplanting. Autos usually prefer one clean transplant early rather than later when growth accelerates. Happy Growing Growmie🌱