You should learn C. It is a small language but to master it requires a lot of work for a reason: you need to get good at design. When all you have in your hands

You should learn C. It is a small language but to master it requires a lot of work for a reason: you need to get good at design. When all you have in your hands are structures and pointers you absolutely need to develop the ability to design well organized programs in different layers of abstractions, otherwise to scale over the 1000 lines of code program is almost impossible. This is probably the most valuable thing C will teach to you.