Looking for a help

Hey everyone!
I’m a newbie in the field of data science with python and currently finished the data visualization libraries and start the ML concepts and I finished a capstone project ‘911 calls’ it was in that course, I’m wondering to practice the entry-level questions but IDK where to practice and which sites would be great? can you tell me some sites or place where to practice, and the other question is 'should I learn SQL and excel '? cuz I’m pursuing with python.
Have fun!