I already talked about it in another rant but here it is !

This year, I got the chance to teach PHP to my fellow students in my uni.
PHP was the first programming language I ever learned (5 years ago) and this year I had a PHP class in my uni. I knew that I would not learn anything new (as I'm more competent than the teacher). So my teacher let me help the other students when I had finished the exercices. Then my teacher got sick and I, kinda officially, replaced him during 3 weeks.
I'm very thankful that he gave me that chance and thanks to him I discovered a new part of IT that I didn't knew. And even if I didn't learn anything new in PHP, I learned a lot by troubleshooting others projects and trying to understand how they reason. I really developed a new soft skill that I never knew I would have.

That also really helped me to trust myself and I got more confident about my programming skills.
This is one of the best experiences I got during my studies so far.