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The sets that are worth learning: ZBLL, certain ZBLS, certain VLS cases, certain HLS cases, certain OLLCP cases, certain COALL/CPELL (same thing) cases, CLL/ELL and random 1LLL and other random OLSs such as BLE.
The sets that are worth learning for ZZ/Petrus: ZBLL, TTLL (only use for the certain TSLEs), certain TSLEs, certain OLS cases (from ZZ-C), optimal last slot algs for all slots, certain WVCP algs.
The sets that are worth learning for Roux: CMLL and maybe a few other things.