As a beginner, the following guide will tell you everything there is to know to power level quickly through the game.
Similar to other MMORPGs Diablo 2 Resurrected also gets harder as you progress further in the game. After you’ve passed down the first difficulty level (normal), you’ll notice that you’re getting the EXP that you used to, so the guide ensures that you get the complete advantage for each run.
Where can I level up?

Depending on your character’s level, there are quite a few locations that offer higher Exp than the normal area runs. It’s because these locations have bigger packs and unique monsters. The whole concept of power leveling is to visit these areas and defeat the monsters that you encounter along the path. Once you’re done, you can exit the current game and create a new one to repeat the process until you’re at your desired level. It may be a repetitive method, but it’s the quickest way.
Levels 1 to 15

Start by repeatedly clearing Tristram, where you need to activate the portal to the location during the Search for Cain quest. The quickest way is to teleport to the Stone Field through the waypoint system, and then search for the portal. Now, head inside and clear out the monsters you encounter. A good suggestion is to focus on the elite mods that spawn in the middle area.
Levels 15 to 24

At level 15, start clearing Tal Rasha’s Tombs (Act 2), which is in the Canyon of the Magi (waypoint), for d2r leveling guide solo. However, you’ll need to first finish the Summoner quest to reach the canyons. The strategy is to enter each of Tal’s tombs and kill the monsters. Once you’re done with one tomb, you can exit and head to the next. The location includes fake tombs too, so you need to keep looking.
Level 24

At level 24, complete the Rite of Passage quest (normal difficulty level) to obtain a level up, as well as the ability to perform Baal runs. For maximum EXP, it’s best that you wait till your level 24, and only then start the quest, for the d2r leveling guide solo. You’ll be at level 25 once the quest is successfully completed.
Levels 25 to 40

Start clearing Chaos Sanctuary repeatedly, or alternatively, do Baal runs. Since Baal runs require fewer efforts, it’s more recommended by players. You can start by teleporting to the Worldstone Keep Level 2 through the waypoint, and then heading towards the Throne of Destruction, for d2r leveling guide. Once you’re there, complete the monster waves, exit the game, and then repeat the process. You don’t need to kill Baal for Exp, but you can approach him if you’re looking for Diablo 2 item drops.
Speaking of Chaos Sanctuary, you can start by teleporting to the ‘City of the Damned’ through the waypoint, and then heading to the sanctuary. Once you’re there, defeat the enemies as well as the elite spawns, and then focus on Diablo for additional loots.
Level 40

At level 40, complete the Rite of Passage quest (nightmare difficulty level) as you’ll be strong enough to be successful, for the diablo 2 resurrected leveling guide. You need to complete acts 1 to 5 for the second time, and then complete the quest to reach level 41.
Levels 41 to 60

Focus again on Chaos Sanctuary and Baal runs on nightmare difficult after completing Rite of Passage. The mechanics are the same for every difficulty, but only harder, for d2r leveling guide.
Level 60

Now, complete Rite of Passage in hell difficulty as you’ll be able to face the horror at level 60. However, you’ll need good equipment because the enemies are stronger. If you’re having trouble with the quest, you can farm runes from The Countess to help you out.
If you’re playing online, you can ask your friends to assist you with power leveling through hell difficulty. Some might offer the assistance in exchange for Hell’s Forge quest runes, so don’t go for that because these Runes can help you get started with your equipment. It’s worth noting that the player may also scam you, so if you’re doing it, do it with someone you trust.
Levels 61 to 99

Finally, clear Chaos Sanctuary and do Baal runs reputedly after completing Rite of Passage at hell difficulty, for diablo 2 resurrected leveling guide. Also, it’s best that you only level up to level 90 or 94 because for the further levels, you’ll need to grind a lot in those locations.
Note: you’ll need to complete the following quests to complete every act – Sisters to the Slaughter (Act 1), The Horadric Staff (Act 2), The Arcane Sanctuary (Act 2), The Seven Tombs (Act 2), Khalim’s Will (Act 3), The Blackened Temple (Act 3), The Guardian (Act 3), Terror’s End (Act 4), Rite of Passage (Act 5), and Eve of Destruction (Act 5).