This Era is about machine learning and artificial intelligence, so what is super important in this era is asking the right questions and finding the right source.
Make sure your questions are adding some value to your knowledge. Your question is helping you to clarify your doubts. Take time to form a question, if you feel confused then write it down, make a diagram, and see what makes sense. spend more time, it's not about doing it quickly but doing it right with a calm and relaxed mind.
To feel confident and start believing that you can be an expert in that 'difficult subject', takes roughly 200 hours and with more effort, you can be an expert in that 'difficult subject'. Knowing this (200 hours rule) will keep your fear away