Gearing up in Diablo IV is both very easy and extremly hard. In order to get higher level gear all you have to do is to simply get your character to a higher level and the gear drop will adjust to that level. However it will adjust to a minimum level and then roll for something better. This means that even if you level up don’t expect the gear to be all at the best possible level. On top of that the perks are also randomised so ti might take a few drop to get the gear you want with the perks you want. Dont forget that you can chance one perk in every gear so you might be able to get what you want.
There are several avenues to follow to get legendery gear:
Complete Dungeons & Events
There are a good number of dungeons that you can explore in Diablo 4 and since you end up facing many enemies inside of them, you have a higher chance of finding Legendary Gear. Most of them have a final boss that can also drop Legendaries. In addition to that, some dungeons, after being completed, unlock aspects of your Codex of Power which is also quite helpful until you find good Legendary gear.
Another good option is to complete the events you find spread in Sanctuary. During the campaign or as you level up in the endgame, you can stumble upon an event happening that might give you a chest from which you may get a Legendary piece of equipment. These events are usually easy to complete, so it’s a good way to farm Legendaries.
World Bosses
World bosses are extremely powerful enemies that spawn in Sanctuary from time to time. If you have enough level to challenge them, defeating a World Boss is a good method to get Legendary Gear.
This method demands a little bit more than completing dungeons or events, but it’s not impeditive for new players that just got to the endgame. And you don’t have to worry about finding a group before the fight begins since receiving an invitation from other players that are also awaiting for the boss is a common thing to happen.
Helltide Events
Helltide events are probably the best method to farm Legendaries. When a Helltide starts, a whole region of Sanctuary is filled with stronger enemies that drop Cinders, which you can use to open chests of specific item slots. There are chests for rings or weapons, for example, and Legendaries always come in these chests.
On the other hand, Helltide events are maybe one of the most difficult methods for players that are just starting at the endgame. First of all, you need to unlock World Tier 3. Then, when participating in a Helltide event, you must avoid dying because you lose half of the cinders you have when you do. In addition to that you can’t keep the cinders to the next Helltide event. If you don’t spend them during the event you participate in, then they will disappear once you leave the area.
Whispers of the Dead
Whispers of the Dead is the second best way to get Legendary gear, although it takes some time. Once you have finished the campaign, you unlock the Whispers of the Dead system, which is tied to missions spread all over Sanctuary. Your goal is to complete these missions to earn Grim Favors.
After you get 10 Grim Favors, you can then visit the Tree of the Whispers in Hawezar and spend them to claim a box in which there are many items and, usually, legendary pieces of equipment. Although the boxes indicate in their name the kind of item it might have – Collection of Helms, for example, might have a Legendary Helm –, it’s not certain whether the box has a Legendary or not, and, if it does, might be for some other item slot.
Even so, spending Grim Favors to get boxes is a safe and easy way to farm Legendaries.