Because of and because are both used to introduce reasons. Be | ENGLISH with SF

Because of and because are both used to introduce reasons.
Because of is a preposition, it is generally followed by a verb+ing or a noun.
Because is a conjunction, it is followed by a subject and a verb.

Here is an example of Because :
Because Maria was feeling sick, she didn't go to the supermarket.

And here is an example of Because of :
Because of her sickness, Maria didn't go to the supermarket.
Because of feeling sick, Maria didn't go to the supermarket.