I beg to disagree with the explanation above

“As” is an adverb while “like” is a verb (like is also used for comparisons).

We tend to use them interchangeable a lot but that does not make it correct, as there is a difference.

As a kid, my clothes were always dirty (I was actually a kid when playing outside)
Like a kid, my clothes are dirty (I am not a kid in this sentence)

Check online for better explanation, but they are not the same

cuando utilizar "as" or "like"

i need to know when i should used "as" or "like". For example:

"Yo estoy en la universidad como tú", "i´m in the university like/as you" = I'm in the university like you / as you are
"me gusta el chocolate como a ti", "i like chocolat like/as you" = I like chocolate like you / as you do
"quiero ser tan fuerte como tu" "i want to be as strong like/as you" = I want to be strong like you / I want to be as strong as you are

Las dos maneras son correctas?

Hi Alba, 
Here is a useful explanation about the difference between 'as' and 'like' in English. I hope you find it useful: http://www.grammar.cl/Notes/Like_vs_As.htm ;

cuando utilizar "as" or "like"

i need to know when i should used "as" or "like". For example:

"Yo estoy en la universidad como tú", "i´m in the university like/as you"
"me gusta el chocolate como a ti", "i like chocolat like/as you"
"quiero ser tan fuerte como tu" "i want to be as strong like/as you"

Las dos maneras son correctas?

I am in university like you.

I like chocolate like you.

I want to be strong like you.

or

I am in university as you are.

I like chocolate as you do.

I want to be strong as you are.