PWAs are great, but you can actually install any web page as an app using a Chromium-based browser.
If you want to get some basic cryptography knowledge and have fun along the way, the website is awesome.
Gacha game fandom is the best. New characters get announced, and a couple of days later, pixiv is already filled with their fan art.
As a passionate tea enjoyer, I can highly recommend the podcast People of Tea .
Make things for fun! Not everything has to be useful or new or a significant improvement over an existing product. Often times satisfying the innate desire to create is all that's needed.
Obsidian is easily my favorite app ever made. I use it for everything from taking quick notes to providing code snippets for my code editor.
So many front-end developers instinctively pick React for every new project without realizing that the majority of those projects won't benefit from React or any similar library.