hi i am new to terraria speedruning what catagory should i start with and can i have some tips. Thanks

Join the discord server is my tip

run journey moonlord

NG+?

My advice would be to join the discord, having conversations on here is kind of difficult. That being said, run whatever you think is fun. In general, stick to shorter categories because you have to remember less information . Watch other people's speedruns for ideas and see if you can replicate them, and then mix in your own ideas to see if you can get faster :)