I don't know if there's such a site, but for C++, I had an awesome time with C++ Primer Plus by Stephen Prata. I love coding books with lots of exercises to do

I don't know if there's such a site, but for C++, I had an awesome time with C++ Primer Plus by Stephen Prata. I love coding books with lots of exercises to do at the end of each chapter and this book has tons of them. Try it out! It's moderately easy for beginners to dive right in but I recommend already knowing some amount of C beforehand.