what is best way for well learning for C++ ?

Question

is it to complete all syntax and all chapter then implement what I know or ... what do u think ?

Answer 1

feeding your mind with all the theory:
then putting your theory to practice

Answer 2

1. Download a compiler so you can run your C++ code (like GCC or codeblocks)
2. Download a good editor (like notepad ++, atom, etc) where you type your code.
3. Download a tutorial PDF or youtube video.
4. Start using #3, type it in #2 and run it in #1.

Getting errors along the way? Understand where those errors came from and fix them by checking your tutorial or google them. You can learn a lot by learning from your errors or mistakes.