TO, TWO and TWO

To is the simplest: it is a preposition and often forms a phrase with a noun: She went to the shops.
Two is the spelling for the number: two eggs.  A good way to remember is that there is a w in it just as there is in twice.
Too is the spelling when something is too much.  Think of yourself saying it in a dramatic way: "It is all toooooo much" and then you will remember that there is more than one o.