If you are having trouble with the Nazgûl in Acts 1 or 2, then hopefully this guide will help.

During Act 1 in "The Fall", the player character will deal with 5 Nazgûl.
They have two attacks, primarily teleporting and striking one after another and occasionally gathering to collectively shoot the player. The player should stay still and pay attention to the Nazgûl's movements, waiting for one to raise their sword, and the player blocks it (right click for keyboard/mouse, Y/Triangle for gamepad). Other Nazgûl will follow up shortly after, so keep blocking until all 5 Nazgûl have attacked or they stop. Take the moment afterwards to attack one Nazgûl three times and then dodge (spacebar, A/X).

When Nazgûl teleport back and collectively raise both arms, prepare to dodge. Afterwards they usually follow up with the first attack. Keep doing these until the Nazgûl are broken and banish them with drain (e, B/Circle) or consume (c, A+B or X+Circle) if you have it. Repeat until all the Nazgûl are dealth with. Later in Act 2, you have to deal with fewer Nazgûl, so deal with them in the same manner.

Hopefully this guide helps you and you have a fun time playing Shadow of War