AT-ST(in speeder) shoot his head. don't crash into him!
AT-AT it's hard to bring one down with a tow cable and takes awhile to destroy with lasers. Shoot his head to speed things up.
Snow/Stormtroopers: the Leebo scanner will help.
Wampas:can take lots of hits and can do lots of damage if they corner you.
TIEFighters/Bombers can't take much hits and may barely ever harm you
Dogbots: don't do much damage and 1 shot will do them in but on the train they can ruin your cocentration where lots is needed.Same as IG-drones
Assassin droids: have armour and deul lasers. In stage 9 use your pulse gun since you won't need it.
Train gaurds: only have a staff but will position themselfs where you'll meet them at point blank range.
Impearial commandos: aren't as deadly as troopers.
sentry droids: station themselves at sneaky or hard to reach places
seeker droids: can become a pain becase they are hard to hit.
Dianogas: are powerful tentecled creatures that live in sewers. They will stick thier vunerable eye from time to time. The Leebo scanner can help.
Coruscant guards: are like troopers only with a bit more armour and laser power
Swoop Jockeys: You must ram them into obstacles or walls but another way is to ram them constantly until they lose control and crash.
Star Vipers: can do some damage to your ship. Armed with bombs, powerful lasers they can be dangerous in a while.