First brain rule says That we cannot do multitasking That means we can't do a lot of things at once
Second brain rule says that always, focus on good ideas Friends, more than 62000 thoughts come to our mind every day
Third brain rule says that if you're thinking of something good So sit with pen and paper because with pen and paper you will be able to think better.
For learn thing long time So what have you read Try to explain it to your friends and while studying read as if you have to explain this topic to someone else