sadgrl.online amazing website, lots of tutorials and assets!
MDN web docs helpful af. mozilla web developers page, lots of comprehensive tutorials on any kind of tag or concept
w3schools lots of tutorials, less explaining of tags and more web-building!
stackoverflow forum for everything tech related! you can probably find an answer to any of your questions here.
cloudconvert converts literally everything ever. really quite beautiful
flexbox cheatsheet lots of flexbox help <3