Friendship bracelets are usually made of cotton threads. The principle of knitting
bracelets is that you are basically just making knots with the threads. Different
order can make different patterns.

If you would like to try kitting bracelets, you can find a video on the left side.
There are instructions on how to do it. If you don't understand how to do it even
after watching the video, or you would like to try some other types of bracelets,
I recommend you to search it on youtube or pinterest.