The dreadnought is the damage-focussed capital class. The Bomb dread is a buffer-tanked short-range anti-capital damage dealer dropped right on top of the enemy while the Sniper dread is similar but uses long-range guns and is used at range against capitals (or perhaps battleships). The HAW dread is an anti-subcap dread with a modest active rep tank.
Often dreads do not get into the fight which is why it's suggested to use dreads on alts, while you have a character flying subcap in the main fleet.
The Siege Module is the defining siege module of the dreadnought. Sieging vastly improves your DPS and local active reps.
However sieging immobilizes your ship1) ) for the cycle duration (5 min) and prevents you from receiving remote reps or cap transfer.2) ) FC will tell you when to siege (siege green) and when to end it (siege red), getting this wrong can result in you being unable to jump away with the fleet and being left to die.
The bomb dread is fit with short range weapons and a buffer tank with an emergency hull energizer (EHE).
Fit short range ammunition (T2 ammo if you have it) by default and change to longer range ammo if you end up being too far from the enemy.
Targets will probably be broadcast for dreads, follow them in order as you would with subcap DPS. Pop pyrolancea drugs for extra damage.
If you are primaried however you are probably going to die as you cannot receive reps while sieged. Overheat hardeners and activate your EHE just before you bleed into hull3) ) , just try to last as long as you can before dying.4) )</sup> )</sup>
This is quite similar to the bomb dread except with long range guns. Your default should probably be T2 LR ammo.
Soon TM