I introduce you to the four most commonly used heel construction methods for both cuff-down and toe-up socks. All of these heel types have also their variations which for the flap and gusset heel are for instance the French or the Dutch heel.
Getting back into knitting for the first time in years : r/knitting
Touhou Hueco científico sock heels knitting Plisado un millón Auroch
Ravelry: Magic Heel Socks pattern by The Autumn Acorn
Ravelry: Magic Heel Socks pattern by The Autumn Acorn
How To Choose the Perfect Heel for Your Hand Knitted Socks – KnitPal
Touhou Hueco científico sock heels knitting Plisado un millón Auroch
Three Knit Sock Heel Styles for Easily Customized Socks - A Bee In The Bonnet
Free Knitting Patterns - Knitgrammer
4 Heel Types of Knitted Socks and Their Variations - Knitgrammer
How to knit socks step-by-step - Knitgrammer
Universal Vanilla Socks Pattern [Works for Any Yarn & Size] - Knitgrammer
The Sock Knitter's Handbook: Expert Advice, Tips, and Tricks: Parrott, Beth, Schurch, Charlene: 9781604680461: : Books
Knitting Like Crazy: The Sock Knitter's Handbook