Answer:
1 - the sun is the closest star to Earth,therefore it appears as the biggest and brightest.
2 - apparent magnitude is how bright a star seems from Earth, but absolute magnitude is how bright the star appears from 32.6 light-years away.
3 - the list of star colors from coolest to hottest is red, orange, yellow, green, white, and blue
4 - Star classification sizes from smallest to largest are white dwarf, brown dwarf, red dwarf, yellow dwarf, blue giant, orange giant, red giant, blue supergiant, blue hypergiant, red supergiant, and red hypergiants
( sorry if i'm wrong )