Questions about bicycles

The Difference Between Rim Brakes and Disc Bike Brakes

https://www.rei.com/learn/expert-advice/rim-vs-disc-brakes.html

if i want to get brakeset replaced with disc brakes

https://www.google.com/search?q=if+i+want+to+get+brakeset+replaced+with+disc+brakes&sca_esv=2580695188120823&source=hp&ei=qIMmacTYBfHhwN4P2sSckAo&iflsig=AOw8s4IAAAAAaSaRuLes2nV9EFr8k78_O14NXltefiWR&oq=if+i+want+to+get+brakeset+replaced+with+disc+br&gs_lp=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_W-BLIHBzIxLjI5LjG4B_kqwgcIMC42LjQ1LjTIB58C&sclient=gws-wiz

Could someone please explain me what the different speeds are used for and the best way to use them?

https://www.reddit.com/r/bicycling/comments/yhmh5x/could_someone_please_explain_me_what_the/

Help me understand cassettes

https://www.reddit.com/r/cycling/comments/w6itxm/help_me_understand_cassettes_at_an_elementary/