What are you talking about bro, I'm a pro at tf2.
You obviously aren't because your list of "strategies" are either common loving sense or just plain idiotic.
1: Double jump and strafe and press every key that relates to movement, but keep your mouse on the target.
Well no stuff.
2: Aim for the feet, your shotgun is awesome, use it
Either you strung together two thoughts incredibly poorly, or you are instructing him to shoot the shotgun at the enemy's feet.
3: WM1, and if necessary, strafe
No. You are handicapped if you think WM1 is a strategy.
4: Don't use targe, stickies are so much more useful 95% of the time. Lead your targets and don't rely heavily on your grenade launcher until you get good with it.
Stickies are only useful on defense. I have never seen good usage of stickies on offense without the help of an ubercharge
5: WM1, always keep an eye behind you for spies, don't let snipers catch you while you are using your minigun
Again, WM1 is a stupid-assed strategy. In addition, how are you supposed to stop a sniper from seeing you if you don't know where they are?
6: Make a base that is has little to no out of range areas that soldiers and demomen can attack it.
There is no perfect base.
7: Heal your team, don't heal spies. Your blustanger needle gun is incredible and can take down and scout with ease.
Considering spies disguise as your team I think it's safe to say that you won't be able to tell if it's a spy or not unless you check.
8: Aim for the person and shoot, body shots are still kills so don't feel like headshots are required
"Aim for the person and shoot." Brilliant job, Columbo.
9: Don't be stupid. Never disguise as a scout unless you know what you're doing. Sometimes I'll disguise as scout just for the extra speed. Also your revolver deals 50-60 damage at close range. Use it.
Way to contradict yourself. A good way to spot a spy is to look at that scout that's never double jumping and is getting passed up by other scouts.