Did you be professionals from this app only please reply
what should I start by, which language??
Welcome to SoloLearn! 😇 You can refer to https://code.sololearn.com/W7X805sc4DPC/?ref=app
Based on what I understand from your question, no, you can't be a professional from an app like this or after reading any book for that matter. These are just resources for you to learn to get you into actual coding or developing.