New to c++

Hello everybody,im new to cpp,and want to learn it,i have some knowledge with C (about 2 years on it),and i wanted something more modern and intresting,so i take c++,where i can learn modern c++ 17 or 20 for free,and which standart to learn first (17,20,or 23)?

https://redd.it/1wzr9pb
@r_cpp