meet L, T, Y, D, Q

meet M-type

meet K-type

meet G-type(watch out for G0V)

meet F-type

meet A-type also, watch out for B9V

meet B-type(watch out for O0V)

meet O-type

meet W, U, U+, WE(WE is litterly a tsar bomba)

meet giant phase and quazi star