Knitting pattern !!!

Hi everyone I’m new to the knitting group and have only recently started to knit, never followed a pattern before and can only k and p st, I have decided I’m going to try and make a cardigan but am struggling on the pattern can you help? This is where I’m up too…
left edge, cast off: 3 sts once, 2 sts once and 1 st
3 times

What dos it mean ???

Hi and welcome to KH!
Good for you for moving on to a cardigan. What is the name of your pattern?
The directions probably means to cast off 3sts at the left edge, work the rest of the row, turn and work back and turn. You’re again at the left edge, cast off 2sts, work to the end of row, work back to the left edge, turn. Repeat the process, starting with a cast off of one stitch.
All the cast offs will be at the same edge, in a graduated line.