No worries, I'm here to help and I'm glad you find my comment useful 😀 Self Improvement is a very good community, lots to write about there.
Please note, the list is not complete, as the number of communities on Hive is endless, but it's a starting point.
About creating a new community, there are more ways, but here's the simplest one:
Go to PeakD, Communities and you have the + sign. A pop-up window will guide you from there. Please write down all the keys the app gives you as it's important.
May I ask what king of community you're planning to start? It would be useful as I'm guiding those who post in OCD. Maybe I can send you a few users :)
Anyway, I hope this helps and please contact me if you need more help :)