Blogging is not for everyone, and certainly not a requirement. On the other hand, writing is a good medium to share knowledge, to get your name out there, to have a connection with other people.

You don't have to share your feelings either. Just open a Medium account, or self-host Ghost/Wordpress etc., and document things you've learned, problems you've encountered, interesting discoveries you made etc. In my experience, this contributes to the learning experience.

Good luck in your journey!