Your pattern has them listed before the directions:
Abbreviations and Techniques
sl1 -- Slip 1 Stitch -- Slip one stitch from the left needle to the right needle. When slipping the stitch, insert the right needle into the loop as if to purl.
yf -- Yarn Front -- Move the yarn to the front, taking it between the needles.
yb -- Yarn Back -- Move the yarn to the back, taking it between the needles.
bYO -- Backward Yarn Over -- take the yarn to the back between the needles and then over the right needle to bring the yarn to the front.
Correct Mount -- The next stitch on the left needle is "backwards", the left leg of the loop is in front of the needle instead of the right leg. Use the right needle to turn this stitch around, leaving it on the left needle.
k2tog -- knit 2 stitches together.
WS -- Wrong Side
RS -- Right Side