Putting thoughts into words is an extremely valuable practice. It makes you a far better thinker, helps you pick & choose what ideas are important, what words to use to think about things. I 100% recommend writing down what you are learning.
There's a much longer form write up on why you should write on a blog or otherwise in a public area, in Swyx's Learn In Public[1]. You're doing it, you're on the path, you're doing great. Keep it up.
The point, overwhelmingly, to me is, you don't know what will be valuable. You don't know when it will be. People are random functions, in randomized situations, and it might be years, but someday either you or someone else being able to run into your words, your posts, & gain some insight: that could make all the difference, for you, for someone else.
One other small plug, some friends have "TIL" blogs or git projects, where they add 1-3 sentence things that they learn. It's really fun, for them, and for their growing audience. Time commitment is low, anything goes for topics (many are 60/40 tech/other), it's interesting to read, it gives the readers some idea of where you are, and best of all, it encourages mindfulness: being on the lookout for what you are learning, watching yourself grow, seeing yourself evolve over time. I love the TIL blogs. Need to start mine. ;)
[1] https://www.swyx.io/learn-in-public/