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The phrase "are three main types" is correct and usable in written English.
It can be used when introducing or categorizing different types of something in a discussion or explanation.
Example: "In the study of ecosystems, there are three main types: terrestrial, aquatic, and aerial."
Alternatives: "there exist three primary types" or "there are three key categories".
Exact(60)
There are three main types.
"There are three main types of husband to choose from".
First, there are three main types - Asian, Siberian and American.
There are three main types of functional sketches.
A. There are three main types of omega-3 fats.
There are three main types of banking and credit institutions.
There are three main types of Rice Mother, which are either found separately or combined.
There are three main types of marine nuclear reactor: pressurized-water, natural-circulation, and liquid-metal.
There are three main types of affixes: prefixes, infixes, and suffixes.
There are three main types: cash, stocks and shares, and innovative finance.
There are three main types of larvae, characteristic of large subdivisions of the animal kingdom.
More suggestions(15)
are three main characteristics
are three main techniques
are three basic types
are three fundamental types
are three main classifications
are three predominant types
are three main parts
are three primary types
comprise three main types
present three main types
address three main types
are three main reasons
are three main methods
are three main objectives
are three main areas
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com