First timer, don't want to get it wrong

Hi I'm a React developer and I'd like to post a question that I need help with.

I recently posted to stackoverflow, with the intention to keep my post as brief and simple as possible but they got upset and told me to come back in 3 days, oops!

Can I post questions here? Can I post code as well? Just want to make sure I don't upset anyone, that's all.

Thanks,

Rich