She's a Border Collie so she doesn't just respond to simple commands, but picks up your meaning from generally talking to her. For example you can say 'A car's coming' and she knows this means she has to get in at the hedge and sit down until it's passed, or you can exclaim 'I've lost my keys!' and she'll go and find them. By saying 'Where's mine?!' or 'I want one too!' after she's given someone else a hand nudge or a kiss she knows to come and give you one too. If I do give her a basic command and she doesn't respond first time because she was distracted by something interesting, I can say 'Um, what did I ask you to do?!' and she'll do it, and she knows 'I'll be cross if you woof!' means she needs to stay quiet (if strangled throat growls at the neighborhood foxes count at staying quiet!). Actually though, bless her, she is a bit of a thicko as collies go - our last you could give a whole string of instructions to - 'Go and find your ball and take it to the stile, and when I get there you can jump it. Then lie down and wait for me' sort of thing. She is a lovely dog though.
Anyway, to answer the question!
Simple commands:
Sit
Stay
Stand and stay
Wait
Come here
Go to X
Lie down
High 5
Big 10s
Bow
Put it in the basket
Bring it to my hand
Put it on the chair
Pick it up
Find X (all of us by name, our hats, gloves, keys, wallets, phones and any of her toys)
Do a wee/poo
Have a drink
Go in your bed
Go on your mat (she does get this mixed up with her bed sometimes)
Shake (water droplets out of fur)
Nudge (my hand with her nose)
Kiss
You can go (after counting, sometimes up to 30. I'm sure she would go longer but doesn't seem fair to make her wait!)
In at the side/on the left/on the right/you can cross (the road)
Come/go through (a stile or gap of some kind)
Jump over
Be quiet
Weave (in and out of legs)
Drop it (or 'Thank you!')
Look at me (makes eye contact)
Other words and phrases she knows the meaning of:
Beach
Walk
Car
Biscuit
Dinner
Are you hungry/thirsty?
Water
Footpath
Stile
Treat/liver/chicken/cheese/Something nice
Birthday/Christmas/Present (she gets new toys wrapped up whenever we have any, spoiled rotten as she is!)
Let's go in the water! (Sea or river)
Vet
Lead on/off
Home
Play
Toys
Plus all the usual 'Clever/good/brave/special/naughty/Oh dear!' type things.
I'm sure there's more but I can't think of any right now. She's a precious Love-Bug, my girl. Mentally and physically exhausting though!!