English Grammar: pick, pick up, pick out

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1. Use "pick" in a general, broader sense of "to select."

"Pick a magazine to bring with you."


2. Use "pick out" in a selective, narrower sense of "to select from a group of choices."

Pick out a magazine to bring with you.
This means: 
"Pick out which magazine to bring with you."
"Pick out from this pile which magazine to bring with you."


3.a. Use "pick up" to mean "to physically lift."

Pick up the piece of paper you dropped on the floor.

3.b. Use "pick up" to mean "to learn" or "to acquire"

I picked up some French while I was in Europe.
I picked up this odd mannerism from a roommate I had in the Uni.