In a case of comparisons, you translate as to 'como' if the comparison is of the same degree (if the two things compared are equal)
He is as tall as me - Él es tan alto como yo.
Ann is as smart as Alex - Ann es tan inteligente como Alex.
For all other cases use 'que'
He speaks Spanish better than me - Él habla español mejor QUE yo.
I sing worse than Pete. - Yo canto peor que Pete.
Also, As = como , if it means "for example/such as" or as an adv (as promised/as predicted/ as expected).
:)