Is it possible to make an actual game in source sdk?

Please give me advice! (SOLVED)

Basepolyforplane: No axis found

Quick question

gamekey not found in gameinfo.txt / library failed to load/ lights.rad not found

Could not load library client?

Source SDK 2007 not launching, Neither does mods

Couldn't read .prt error

where i can download valve hammer world editor

My Hammer Editor doens't show up "Team Fortress 2" in it's "game configurations to use" tab.

Hammer Access Violation

Hammer++ For Linux.

2007 Source SDK mod not working