honestly, to make FM bass like this, open up sytrus, on OP1 change the modx on the phase of the waveform graph so you can use the X/Y grid, changing the phase of a waveform is what makes the ''wobble'' in FM basses, then route another OP into the first ones path so you can get a modulation source, most FM basses utilize 2 Operators with an X/Y mod changing the phase,
the first waveform is the dominant portion of the sound whilst the second waveform is the one that changes, or modulates the first waveforms pitch, DnB, dubstep, neuro, all those genres revolve around this simple form of sound design, its very easy to do it with sytrus
check out this guys youtube, he makes great tutorials, he knows what he's doing so you actually learn, and he uses FL studio
https://www.youtube.com/channel/UC2mgCVJWitRUTIpgd7pLung