Here is some types of stars there is---
P-type = Planemo AKA Rogue planet
Y-type Brown dwarfs
T-type Brown dwarfs
L-type Brown dwarfs
M-type Red dwarf stars
K-Type Orange dwarf stars
G-Type Yellow dwarf stars
F-Type Main sequence stars
A-Type Main Sequence stars
B-Type Main sequence stars
O-type Main sequence stars

Other classifications
X = Black hole
Q = Neutron star
C = Carbon star Other types C-R , C-N , C-J , C-H , C-Hd , SC
S = Zirconium star
D = White Dwarf Other types DA , DB , DC , DO , DQ , DX , DZ , DBA , DAZ ,DBZ ,DBAV

Luminosity size Classification stars.
Class VI = Subdwarfs like Kapteyn's star with 2 planets
Class V = Dwarf or Main-Sequence Stars Like our sun that we see all the time
Class IV = Subgiants larger then the sun when they burn hydrogen fuel Like Procyon A
Class III = Giant | Stars that are burning hydrogen fuel on there final stage Like Arcturus
Class II = Bright Giant Like Beta Leporis
Class I = Supergiants Other types (Ia = Luminous) (Iab = Intermediate) (Ib = Less Luminous)
Class 0 Or Ia+ Hypergiants | There are massive stars out there and very luminous like these stars Eta carinae, YV Canis Majoris