ALSO. OPTIMIZING. im pretty sure one of the videos i attached go over it but try to avoid ngons (face with 4 or 5 more sides) and dont use too many faces/vertices that it lags everything
watching other people model helps too!!! sometimes u pick up on shortcuts and the processes that they use

after u get the hang of the basics honestly just model whatever u want to model whether or not u know how to

start with basic shapes

if ur not sure how to do something OR if you want to find a way to make things easier then just search it up. the internet is a gift it can teach u alot of things

depends on what SPECIFICALLY you want to learn to model

for characters i remember starting with these 2 videos (tho theres probably way better videos out there lol)
youtu.be/JoykuXaPpWk?...
youtu.be/AlPPYkZg9D4?...

HELLO!!!! PEAK DESIGNS!!!!!!!!!