from experience, I hesitate to say Haynes manuals are probably the best for stripping down bikes. where they lack is the general quote "reassembly is the opposite of dismantling". you sometimes have to flick back and forward to complete the build.
Clymer (American) manuals are well written but lack fluidity. its section by section but not necessarily in the correct order.
Harley OEM manuals are the same style as Clymer, same fault.
Rupert Ratio's singles book is the best descriptive and comprehensive which includes modifications , both BSA and owner revisions.
Roy Bacons books are general well informed histories but not necessarily "how to" guides.
BSA (and other marques) official manuals are the original "how to" but are like Harley ones , hard to follow and not in sequence.
BSA parts books are invaluable for part numbers and general exploded views.
there used to be a series "Autobooks" mainly cars similar to Haynes but not many and no bike ones.
internet sites like Carl Salter and PDF moto manual have factory and Haynes manuals, parts books and sales literature mainly modern but some classic manuals.
other web sites cater for exploded diagrams for marque specialists.. Trevor Pope KTM, Fowlers Honda, Yamaha, Suzuki etc, Lings have modern Triumph, CSMNL look after Honda, Suzuki, Yamaha.
I tend to follow OEM as they built the bike originally but mainly the in depth sections, Haynes used as strip down and rebuild.
the problem with forum "how to's" is that we have all found our own different ways coping with problems . I doubt there are many owners with as large a tool box as I have, many spanners have been adapted for use and a lot of specialist pullers and tools covering all makes which are multi bike useable.
members posting a "how to" will no doubt end up with other contributors, adding you want to do this instead of that, thus making it confusing for others. it happens here and other forums eg look at the recent oil seepage thread. the official way or the bodge way, which one will last? as I found, the Royal Enfield way ends up peeling off after a while and back to square one.