Materials:

Worsted Weight Yarn (I used less than half a skein)

Size 8/5.00mm 16” circular needles and/or double pointed needles. (dpns will be used for the decreasing specifically, but can be used for the entire beanie.)

Scissors
Measuring tape
Yarn needle

 
Techniques Used:

Invisible Join:
Tutorial: https://www.youtube.com/watch?v=idghalAiuZQ

Work in the round
Tutorial: https://www.youtube.com/watch?v=ggP8VhXqKF8

Ribbing
Tutorial: https://www.youtube.com/watch?v=3v7SGqo_Rrg

Decreasing
Tutorial: https://www.youtube.com/watch?v=ptZsAT770i8

Work in the round with double pointed needles:
Tutorial: https://www.youtube.com/watch?v=p9OrDriAmtI