Building an advanced guitar tuner with special features with a seeduino and a grove starter kit

I don't even know how to start writing the code yet, I just want understanding of how this works so I can start figuring out how to make it all work together.

Just like a baby can't walk at birth because you tell it to walk, I can't just type random letters, symbols and numbers and then say "now work!" and have it do my code. I have to understand how this stuff even works in general first.

Like I said I have almost no coding experience. This is my first project I'm trying to do without complete guidance.

Please don't be so harsh, I'm trying to get help and I do not know what to do at all right now.

I do not wish for free code, just for an understanding of how coding works and what types of lines I should put in by myself to make this.

I just don't even know how to start...