There are Three Types of Black Holes which are discover recently those are as follows..
Primordial :
The Primordial black hole is small as "Atom" in size but have a great capacity of suction but do not think about its small size its mass is same as a big "Mountain".. .
Stellar:
The Stellar black hole is small as fits into 10 miles only but its mass as 20 times bigger than the Sun..
Super-massive:
The Supper-massive black hole is very big in size as a "Sun" but its mass is same as of millions of "Suns"..