Idon't understand superlative and comparative forms of an adverb. could anyone me?

-The comparative form is used when you compare 2 people or things. For one syllable  or 2 adverbs, you add "-er" to the adverb. And for the others, you add "more".
Example: I am taller than you. (The adverb is tall, we added -er).
I am more beautiful than you (we added "more")
-The superlative form is used when you're comparing 1 person with 2 or more other persons, or 1 thing with 2 or more things. Same thing as the comparative, but it's -est instead of -er, and "most" instead of "more":
Example: I am the tallest of you all (or simply I am the tallest)
I am the most beautiful

Hope this Helps! :)

Comparative is when you compare what is better than another. 
Superlative is which one is the best than the rest.