I'm trying to mod my ford 2016 focus, Its my first car what is a mod i should start with?

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Mod your focus into any other car than a focus.

A new engine, a new dash, a new electric system, a new fuel system… Get the picture.

if you can take it back, I would, the focuses do not have a good track record. I would go for the F-150, much more reliable

Wherever you might start you would be voiding your Ford warranty on the Focus. I doubt seriously you would wish to do so.

Just drive it until it's out of warranty.

A 6 inch lift kit would be unique

If you wanted to mod it you should have gotten an older car. Cause with a new one you might limited to what you can do without voiding the warranty