Gustar = To like
Me gusta(n) = I like Nos gusta(n) = We like
Te gusta(n) = You like Os gusta(n) = You all like
Le gusta(n) = He/She likes, You like Les gusta(n) = They like/You all like
Gustar is a very different verbs, and later on you will learn other verbs that follow this format. You do not say I like in Spanish, but more like Me like (or Chocolate is liked by me, using indirect object pronouns).
The verb gustar only has two forms: gusta or gustan.
You use gusta if it is followed by a singular noun, and gustan if it is followed by a plural noun.
You use gusta with a verb, whether it is one verb or many verbs.
Me gusta el chocolate. = I like chocolate. (This can mean I like all chocolate in general, or I like the chocolate in front of me)
Me gustan los chocolates. = I like the chocoaltes (This means I like all the chocolates in front of me)
Me gusta bailar. = I like to dance.
Me gusta bailar y cantar. = I like to dance and to sing.
You never use the subject pronouns, yo or tú, in front of gustar
To emphasize or clarify:
You can add other pronouns in front of gustar, to emphasize that someone likes something, or to clarify who it is who likes it.
A mí me gusta = I like
A ti te gusta = You like
A él le gusta = He likes
A ella le gusta = She likes
A usted le gusta = You like
A nosotros nos gusta = We like
A vosotros os gusta = You all like
A ellos les gusta = They like
A ellas les gusta = They like
A ustedes les gusta = You all like
If you want to use a name, and say that he or she likes something, you MUST put "A" in front of the name:
A María le gusta el helado. = Maria likes ice cream.