[giomasce]

Since UB can be a bad beast to tackle while learning C and C++, I would suggest to frequently compare what you learn with cppreference.com, and check that you understand that what you think matches what the standard dictates. Cppreference is not the standard, of course, but is sufficiently similar and much easier to read.

If at some point you want to really become a master, then switch to the actual standard.