Hello, You can refer to many YouTube channels and now a days apps like Byjus, unacademy, gradeup etc. provide video lectures. But you need to refer to websites like Clearias, Drishti ias etc. to know the essence of note making . You need to take your own notes from the video sources and refer the websites to know how to construct a essay from those notes. Apart from these external sources you need to be regular in reading newspaper, NCERTs and other standard books.

Best wishes.