Yes. If you have an accurate watch and a sextant, you can calculate your position quite accurately. But even without those tools, there is one constellation that will help you find north (if you are in the northern hemisphere). That constellation is Ursa Major, also known as the Big Dipper.
Follow the two stars at the lip of the bowl of the dipper for seven times their separation, and you will (weather permitting) see a solitary, not-particularly-bright star. That star is Polaris, the North Star. The direction of that star is within one-half degree of true north.
There are no constellations in the solar system. They can only be seen from Earth and from the other planets in the Solar System. They can help us learn about the rest of space and the Solar System itself. We can also study stars in the constellations and help us learn about our own star, the Sun.
Ursa major and USA minor
That doesn't make sense. A constellation is basically a direction in space; you don't count constellations per galaxy or similar regions in space. There are 88 or 89 constellations (depending how you count them); these constellations cover all the directions around us, and are not related to any specific galaxy.
Because the Earth travels around the sun, so there are always some of the constellations in the direction of the sun ... which of course is a terrible direction to try and see stars. But after a month or two, the Earth swings us around a little farther, and then those particular stars are not in the direction of the sun any more, and we can see them at night again.
They help us to map the night sky, but don't tend to help us from day to day. Some people called astrologers (not astronomers) believe that their positions in the sky will have an effect on our lives, but that's just nonsense.
Because we are in the Milky Way galaxy, where there are huge numbers of stars in every direction from us that can be seen any time the sun isn't up in the sky.
The same ones as in the US.
Signpost: from the past, it help us to go to the right direction.
noting
You can see alot further in the direction you're going and see the compass more easier
The size of stars depends on their mass and the stage of their life cycle. Constellations are just stars which happen to lie in the same general direction from Earth, and have nothing really to do with each other. Apparent brightess of a star or galaxy is the result of its intrinsic brightness and its distance from us.
You give us no choices to chose from to help you anaswer this. Following what?