How to be expert in Arduino ?
Practice.
Paying attention to simple instructions.
Oops
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Installation & Troubleshooting
(Installation & Troubleshooting - Arduino Forum)
For problems with the Arduino IDE (integrated development environment). NOT for problems with your project.
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Start at the beginning. You should explore being a novice in order to work your way up to expert.
just moved to the General Discussion section of the forum.
And in addtion to SemperIdem
Practice - Practice² - Practice³
[Read - Learn - Make] is a golden rule.
That makes no mathematical sense
Or, in medicine "See one, do one, teach one"
Adding:
Hang around on the forum to see which problems people encounter and help them to solve those problems.

expert in Arduino
How do you become an expert in anything?
Do... fail... learn... do... fail... learn.
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