Comparisons of equality
To compare adjectives and adverbs we use the following formula:
tan + adjective/adverb + como (as....as)

Let's look at some example sentences:

Es tan bueno como lo esperaba.
It's as good as I expected.
Su salón es tan grande como el nuestro.
Your living room is as big as ours.

In terms of a noun we use a similar formula:
tanto(s), tanta(s) + noun + como (as much...as) (as many...as)

Tiene tanto dinero como puede desear.
He has as much money as he wishes.

[ other examples ]

Comparisons of inequality
It is expressed by placing the formula:
más, menos + adjective/adverb + que

Let's look at some example sentences:

Esta motocicleta es más bonita que la roja.
This motorcycle is prettier than the red one.

Mamá es menos obesa que mi abuela.
Mom is less obese than grandma.

Verbs may be used to make comparisons:
Usted viaja más que él.
You travel more than he does.
El autocar tarda tanto como el tren.
The bus takes as long as the train does.

[ comparisons using verbs ]