Hello Rittik,

There is no way to say this teacher is best or that teacher is best. This is just our way that which teacher's concept we are understanding better.

Here I am providing you a link of some good channels on you tube through which you can see videos and take help.

1.CrashCourse | Educational Videos

2. The Organic Chemistry Tutor

3. Professor Dave Explains | Teacher Youtuber

4. TED-Ed - Lessons Worth Sharing

5. Sixty Symbols

Good luck