I learned to use Arduino on my own with help from YouTube videos. So when I was just starting out, I faced a lot of challenges. So I know a lot about troubleshooting. Ask me anything about your problems with Arduino.
I am currently making a complex line follower and grid solver using Arduino. I am using IR sensors make it. I have programmed the mini-bot to follow any dark and inversed path. But I'm still working on the grid solving part. Every day I face a new problem with it and I solve it. Thia way I keep learning new things.