You're only allowed to have one mercenary in a given time

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Diablo 2 doesn't have an endgame that you'd expect from the modern-day game, and at some point, you'll be spending all of your time doing boss fights, in which you'll repeatedly fight the boss in order to collect better items. But even before reaching the end of the game, you could find yourself underpowered D2R Items, so you'll want to grind out XP (and hopefully get some useful items) through repeating particular sections within the game. Tristram The Countess Act 1's catacombs, the tombs of Act 2 and the Act 3's Council etc. are great grounds for earning more XP quickly than usual; be prepared to play through these several times.

Hire a mercenary for help

As previously mentioned, the Necromancer's ability of summoning allies can be vital to take some energy off your body. It's a good thing that everyone has the ability to solicit help even without diving into multiplayer. As you progress through Act 1 story, you'll gain the possibility of hiring your first mercenary from Kashya (one of the NPCs in the Act 1 town, the Rogue Encampment). There are various types of mercenaries you'll be able to hire as you progress through the game, starting with the bow-wielding Rogues of Act 1.

You're only allowed to have one mercenary in a given time, so it's important to ensure you select one that matches your particular class. Be aware of their abilities when you're looking to hire one. A rogue that has Cold Arrow (which slows enemies however it does not deal as much damage) could be ineffective to you , if you're a Sorceress that is already slowing enemies or a Necromancer with summons who will divert enemies focus.

When you've got an mercenary, be sure to outfit them with equipment that will increase their effectiveness. A further point to remember is that ethereal products that aren't repairable and are not repairable, can be useful for mercenaries due to the fact that the items that are equipped with mercs don't Diablo 2 Resurrected Ladder Items degrade in durability.