How were castles built / constructed in the medieval period?

How To Build A Medieval Castle From Scratch

How To Build The Ultimate Medieval Castle

Castle Builders: The Secrets of Medieval Engineering - Full Documentary

Guédelon Castle: How to Build a Real Fortress with 800-Year-Old Tools - Full Documentary

Guédelon Castle: Building A Medieval Castle From Scratch

Building a medieval castle from scratch

How to Build a STUNNING Medieval Castle | Minecraft

How Columns & Arches Make the Best Castle Builds in Enshrouded | Guide