Whenever you want to express an action that is unexpected, unplanned or accidental in Spanish like “Mycell phone fell from my hands” you would need to use the “se me”structure: “Se me cayó el celular”.

I was just reading a blog on learning Spanish, and saw the following text:

No matter how old you are, you will want to start off with very basic words like dog, cat, hello, goodbye and other kindergarten level words. If you are a grown adult you might feel a little silly at first, but as you advance in learning you will learn more difficult words and discover how to read phrases as well.

While the concept of starting off simple, the examples they give you when you "start off" are not great examples.  According to the American Council on Teacher Foreign Languages and other leading experts on learning languages, there is a deeper psychology into how specifically you need to start of "simple" when learning Spanish.  Let me explain:

Cognates are words with the same origin and the same meaning like: frustrated/ frustrado; idea / idea; person / persona. On the other hand, falsecognates are words that may sound and look very similar, but becareful, they may not mean the same thing. This is probably becausethe historical origins of the words are different.