It is possible to start from scratch

Answer 1

Yes, it is very much possible. I knew nothing about C++ until I started learning about it here.

Answer 2

How can you start learning from the beginning

Answer 3

you have completed all stages

Answer 4

I stumbled and fell, and I had some friendly people motivated me not to give up. So I got back and try again.

No, I have a lot to catch up, I've been missing classes for a long time : )