Speed
HG hubs are designed for Shimano/Sram 8-11 speed cassettes. Aftermarket 12 speed cassettes are available up to 11-51t.
Non-boost mtb bikes have 135mm spacing in the rear and a 45mm chainline. A common problem with 1x drivetrains is accidental downshifting while backpedaling on the largest cog. You can find chainrings like Garbaruk with a few mm offset to bring the chainline in.
Shifters
Crankset
Rear derailleur