I just tried IBM Quantum Composer[1] after reading through this Colab and finding I didn't know enough about quantum circuits to do anything besides clicking play. Quantum Composer gave me a super simple drag and drop GUI for getting familiar with basic circuits/building blocks.
I made it 20 minutes before having to look up a Bloch sphere (happens when you start experiments with 'S' and 'Z' blocks which add phase shifts). I don't directly use a lot of IBM products, and I had a great experience with this one!