Need help with triangle/square blanket

I need help with this…I haven’t knitted in several years. This blanket is supposedly easy but I am having trouble starting it. I have always knitted things without a pattern so reading a pattern is difficult. Do I start with 1 stitch nd then do the knit into front and back? Would anyone be willing to make a video and post it on Youtube so I can understand how to make a triangle?

Thank you

P.s. The link is in the first reply.

Welcome to KnittingHelp!
Yes, start with one stitch cast on. Then for Row 1, knit into the front and back of the stitch. Row 2, Kfb, knit one. You’ll have 3 sts by the end of this row. Continue in the same way, each row adding a stitch to the beginning of the row.
When you change color and begin the decreases you’ll end up with a square. It’s a lovely looking blanket with clever color changes.