Hey jamalkoiyess.
Riemannian geometry is basically looking at geometry where the different components (like axis, basis vectors, etc) are dependent.
This means that instead of different pieces of information being independent (where you change one piece of information and the others stay the same), they are dependent (meaning you change one piece of information and it will - in some case change something else).
That is the intuition behind differential and Riemannian geometry. It just means that instead of the information in each co-ordinate (or basis vector) being independent, they relate to each other in some way.
Things like space-time have this property where if you change one thing then it changes the kinds of values that the other should have.
It used to be that people thought that the best way to understand things was through independence - but eventually a few mathematicians realized that it might be a good idea to look past that and it's applications have been used extensively (including in the well known use of General Relativity).