Tab
Make hammer
Equip hammer
right click with hammer to craft menu
Make workbench
Make roof and walls for workbench
interact with workbench

Repairs are free <hammer icon in workbench near center>
Everything except consumables are returned, example wood from fire.

Pick stuff up to learn more recipes
Make nails when you can. Those are pretty much the only thing you need to craft to get the additional building options other than just pick up mats or processed ore.

That is a basic guide to get started.
If you miss a hint from the crow you can check the compendium in your Tab menu crow icon.

Good luck, have fun!

Crafting menu in hammer is logically set up... items after workbench will be workbench upgrades, items after forge will be forge upgrades etc.

Food is very important. It is your only health and stamina upgrade system.
Stamina use is also reduced with skill increases but food is the only way to increase the pool of stamina. Stamina management is pretty key in the game.