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(Naming/Listing) There are (three) main/major ............................/features… of (something)
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(Naming/Listing): (Something) could be .................... in (three) main ways.
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(Naming/Listing): To be specific/...............................
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(Naming/Listing): Besides/Moreover/In addition/............................
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(Naming/Listing) The most outstanding/notable/..................... + example of/feature of/characteristic… of + Sth is …
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(Classification): X could be ......................../classified into (three) main/major/principal groups/types, namely A, B and C
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(Naming/Listing): Sth could also be .......................... by + Sth
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(Naming/Listing): For example/For ..............................., S+V.
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(Classification): Another kind/type/group/way… of X is B. In/by ........................to A is B, another type/kind/way… of X.
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(Classification): The main/major/principal groups/types/ways … of X ...................of A, B and C.
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(Classification): Another kind/type/group/way… of X is B. ....................... A, B ...
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(Classification): There are (three) main/major/principal types/groups/ways … of X, .................A, B and C.