How do I practice c++

Answer 1

code playground

convert codes in other languages to cpp

Answer 2

1) Sololearn Code-coach
2) Leet code
3) geeks for geeks

If that's not enough then :-

4) Codechef
5) Codeforces
6) Hackerank
7) Hackerearth
8) topcodee
9) SPOJ
10) Code war