Quick answers
What are the default PC controls in Team Fortress 2?
W, A, S and D move, Space jumps and Ctrl ducks. Mouse 1 fires and Mouse 2 is the secondary attack and every class skill, Mouse 3 the special attack and R reload. 1, 2 and 3 pick the primary, secondary and melee weapon, the mouse wheel cycles them and Q goes back to the last one; 4 and 5 are the Engineer's build and destroy tools and the Spy's disguise kit. E calls for a Medic, G taunts, F inspects, T sprays, V is voice chat, Y and U chat, Z, X and C the voice menus and Tab the scoreboard. The comma and full stop change class and team.
How do you call for a Medic in Team Fortress 2?
Press E. Call for help is on E by default, the same call as the first line of Voice Menu 1 on Z.
How do you disguise as Spy in Team Fortress 2?
Press 4 for the Disguise Kit and pick a class. B puts the last disguise back on, and with the Disguise Kit out the minus key switches the disguise to the other team — R does the same. Mouse 2 cloaks and uncloaks.
How do you build as Engineer in Team Fortress 2?
Press 4 to build and 5 to destroy your buildings: the two slots the Engineer's PDAs use. Q cancels the PDA menus.
How do you drop the Intelligence in Team Fortress 2?
Press L. The same key drops the Australium briefcase, Powerups and Player Destruction pickups.
How do you taunt in Team Fortress 2?
Press G. Taunts is on G by default, and Q cancels the taunt menu.