Last Hitting Etiquite when sharing a lane?

So I'm really new to the game and have been watching some vidoes and whatnot trying to figure stuff out.

One thing that was mentioned was "Last Hitting". I've seen some videos where people just dance around and let your own minions take the health down on the enemy minons and then you sneak in and get the last hit and the gold.

My question however is how does this work when you are sharing a lane with another team mate? I would think it's bad form to do this as you're taking the gold away from your team-mate. I find it hard to follow all the little guys around so I can't really tell if the teammate has been slowly whittling down a guy and then I swoop in and take the gold.

Is there some sort of general behavior regarding "Last Hitting" when duoing a lane?

Yeah, there is. If you are playing a carry, you should be taking the last hits. always. If you ar playing support, you should be taking close to 0 last hits. Finally if you are in a lane with a non carry, the one who is more effective with items takes the farm

Ahh, that makes sense. I'd heard of the carry role. Thanks for the answer.

Same topic I guess, what do you do when there are say, multiple carries in the same lane? I've only played about 12 games online, and so far everyone and I mean everyone plays a carry. I play support mainly atm but when I do go carry it's just annoying having to compete for last hits. Even the rare support I have seen goes for them. People aren't very receptive when I ask to not take them.

I'd recommend you to watch this video, it'll answer all your questions.
Play Video

You shouldn't have more than one carry in a lane. If you are then one of you just needs to stack and pull and stack and pull on repeat.

My suggestion is to start picking carries who can jungle, it sounds like you're in low skill level games at the moment, and if you play someone like Doom or Lifestealer, and you see the lane picks are a little wacky, you can go into the jungle or as SP12 said pull and stack the creep camp.

Lower level pug's don't seem to do it at all, its a thing i have found, i either have to go jungle mid or fight for last hits, (ofc if I play support I don't normally get any unless my team mate is around)

I tend to find if you que a bit longer for captain mode, people there know the Idea a bit more and you get slightly more team work out of it... not a lot with all pugs but a bit :D

A cary is a hero that makes the best use out of gold, such as having abilities that have benefits from some high priced items. A hard support is a hero that is good without gold so it can be strong from the start and not need many last hits. The trade off is when a farmed hero gets tons of gold they can walk all over the gold independent heros. Any hero can carry but only a few are the strongest when at full six items.

Example: Anti-Mage and Crystal Maiden lane. Anti-Mage has a % spell shield that is good all game a blink that is good all game and a orb that benefits from attack speed (you get items that give attack speed so this scales) and a % ultimate. Crystal Maiden's first skill does lots of damage, but does not scale. Her second skill is an almost stun so it scales. Her third spell is a passive mana regain increase, no % so it does not scale. Her ultimate does crazy damage but since it is not % it does not scale into the late game. Since all of Anti-Mages skills work late game at full power it is a good idea to give him the gold to back them up.