Where is the best place online to purchase supplies for my bp? Such as lights, uth, etc.

What is the best way to monitor the temp and humidity in my tank?

What is the optimal temp for the warm side? The cool side? And what's optimal humidity?

I'm sure these questions are answered elsewhere, but I'm on my phone and can't navigate properly.

Thanks so much for the help. Trying to help my teen care for her new reptile friends.