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Can someone explain to me how to correcty do a landing page?

Because I have no idea what to do.

Anyways...

Don't reinvent the wheel, and just use existing stuff. Bootstrap and JQuery still exist btw. You don't have to write everything by youself, it's gonna take weeks years. But who am I to listen to?
I once put

#define PI 5 // The Engineer way
#define e PI // XD

in my C math library, so I might not be the best guy to ask for code related advice

Why did I make a "C math library"?

I couldn't include the standard one