It's pretty easy to resize a simple knitting pattern, and the skills you use are the same ones you will need to tackle more complex adjustments.
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Understanding knitted fabric - a left- and right-handed knitting tutorial
A Simple Baby Pullover and Free Pattern by Erica Kempf Broughton - Kiku Corner
Briar Rose Vintage KAL: Resizing the knitting pattern, Part 1 - Tasha Could Make That
How to Knit a Farmhouse Kitchen Dishcloth - Making it in the Mountains
Highhill Homeschool: Simple Fabric-Yarn Doll Tutorial
How to Resize a Knit Blanket, Dishcloth or Towel · Nourish and Nestle
Easy Guide to Pattern Grading on Bluprint!
Sewing a knit top with contrast details - The Last Stitch
How to Resize Your Knit or Crochet Garment by Using Thicker Yarn
Diagonal Knit Square, A Free Pattern
Untwisted and twisted stitches - a left- and right-handed knitting tutorial
Learn to knit and crochet with Easy Knits. Easy knit and crochet patterns