How to understand the patterns?

Hello,

I am new to the forum, glad I found you.
My confusion is in reading:
Knit 5 rows, inc 4 sts evenly across last row (x sts). Proceed in stocking st, inc 1 st at each end of needle on 3rd and every row to 104 sts, then on following alt rows to 122 sts.

Am I understanding that on 3rd row and every_one after I am adding a stitch at the end and beginning of the row?

Welcome!
Yes, that’s it. Increase at each end on row 3 and every following row to 104sts, then every other row to 122sts.