study projects discussion

[s2te]

📢 this is my first time opening a discussion, so please, bear with me.

I am aiming on a solid knowledge of CSS and javascript, so the main propose of the discussion, is so more experienced developers could lend me some advices on what to practice before going to frameworks/libraries.
yes, there are plent of videos online, but I think it is important to interact with the community.
any project ideia that is not much explored by beginners, suggestions on on-going projects, documentation, online courses, anything that you wish you knew when you started, would be very much appreciated.

whether portuguese or english, feel free to join with the language of your preference, and thank you!