To is used when you're talking about doing something or going somewhere. For instance, "I want to play soccer."
Think of to as a way to express a goal or direction, like "I want to study."
Too means also or extra. It's like saying "in addition" or "more." For example, "I like pizza too," meaning you also like pizza.
Too is like saying "also" or adding something extra. For instance, "I like chocolate ice cream too," meaning you like it in addition to something else.