Being on top

Okay so I need some pointers. My boyfriend and I have GREAT sex. We’re very open about what we do and don’t like with each other and we’re open to trying new things together. But last night after we had sex I noticed he was very tired so I asked him why he didn’t have me go on top and he said “because you need practice.” I’m fine with it and not offended (okay maybe a little) but I just want to know how I can get better at being on top. What positions I can try, what techniques, I’ll take any and all suggestions.