But the thing is....
A lot of strats have lost meaning due to the inflation of easily obtainable i100+ gear & the fact ppl u run with in df will probably make it into a spee run etc.

I.e Zu ( 2nd boss in pharos sirius)
Ppl used to do the egg hatching/ kill adds mechanics but now they often go with the zerg zu strat.
So if u watch a guide explaining how to do mechanics u might be wasting ur time.
Another good example is turn 2 BCoB, ppl used to do allagan rot till ppl learned about enrage mode. Now 80%+ of df parties will do enraged over allagan rot mechanics. So again videos online will not do much UNLESS u just want to see how mechanics r supposed to be like.