What’s your favorite court in the city?

I played tennis for a while today and my hand and fingers are hurting. That has never happened to me before. Any suggestions why that might be? Was I holding the racquet too tight?

What resources are you guys using to learn, if you're just starting out as an adult? I just discovered how fun tennis is, but I'm worried that I have a lot of catching up to do and don't know where to start. I don't really have a budget for classes right now since I'm a student. I have a racquet that my sister bought for me, and she gave me a bag of balls to get started with.

Do you guys recommend any courts in the city where you can just drop in and play ( of course if the courts are available) vs booking online and paying a fee?

Any advise on how to generate power behind you serve/strokes? Thank you!