Caesars cipher

Can u guys explain to me how to make a caesars cipher. I've only been doing c++ for a couple days but ire ally want to do a cipher.and can you help me make It as simple as possible shifting each letter 2 spots.i don't want you to give me the code I want you to help me with it and explain it to me please. I want it to use strings and char...thanks. Moot
I know someone already posted about ceasers cipher but I want help with a really****simple 1
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