These commands play with your character's numbers. The skill command raises any skill you want without grinding it point by point. The carry weight command completely solves Skyrim's most annoying problem, being constantly overencumbered.
Most codes here need cheats turned on first. See the section on how to open the console.
tgm
player.setlevel 50
The number at the end is the level you want. Careful, enemies also get stronger as your level goes up.
advskill smithing 10000
Type the skill name and the amount of experience. Smithing in the example can be swapped for the English name of any skill you want.
player.advlevel
Your character gains a level and you earn a perk point. Repeat it to gain as many levels as you want.
player.setav health 1000
The number at the end becomes your health. Use the same pattern to set magicka and stamina too.
player.setav carryweight 10000
Being overencumbered stops being a problem. You no longer have to leave loot behind on your way out of a cave.
player.setav speedmult 200
The number at the end is a speed multiplier, and 100 is normal. It makes getting around the map much faster.
showracemenu
Edit your character from scratch, including face, race and name. The only way to change how you look in the middle of the game.