Web development and being a "programmer" often feels overwhelming. The amount of information out there is very intimidating. Especially when you're entering the field it's very easy to feel lost and stuck.
Writing down learnings helps to fight this feeling. With this project you can easily start building a central place to see the progress on your learning journey.
And maybe (just maybe)... you want to share your learnings, too, because what you'll learn over time is that nobody knows everything and that every learning from your perspective can be completely new to someone else.