How to level up from 10 to 20 in WoW Classic? Basic Guide

Here is a guide on how to level from 10 to 20 in World of Warcraft Classic:

1. Once you reach level 10, you will have access to a new zone where you can continue leveling up. The next zone will depend on your faction, but for Alliance players it could be Loch Modan or Westfall and for Horde players it could be The Barrens or Silverpine Forest.
2. Take on all the quests available in the new zone. These can be found by talking to NPCs (non-player characters) with a yellow exclamation point above their heads. Quests will provide you with experience points, gold, and items that will help you level up.
3. Kill monsters while completing the quests. Killing monsters will also provide you with experience points. Be sure to pay attention to your character's experience bar, and to group with other players to kill monsters more efficiently.
4. Complete dungeons like the Stockade, Deadmines, Wailing Caverns, or Ragefire Chasm ( if horde) You can access these dungeons by talking to the NPC who starts the quest chain which leads to the dungeon. Running these dungeons will give you a lot of experience and will also give you a chance to get some good gear.
5. Repeat steps 2-4 until you reach level 20.
6. Once you reach level 20, you will have access to a new zone where you can continue leveling up. The next zone will depend on your faction, but for Alliance players it could be Redridge Mountains or Duskwood and for Horde players it could be Ashenvale or Hillsbrad Foothills.
7. Keep in mind that as you progress and level up, you will encounter tougher monsters, and it will take more experience points to level up. But as you level up, you will also become stronger and able to take on more challenging content.
8. Also, you can use the map to check for available quests and where to find them, and use the quest log to track your progress and turn in completed quests.
9. Finally, it is important to keep in mind that leveling up in World of Warcraft Classic can take a lot of time, so be patient and enjoy the journey.

Finally, don't hesitate to join a guild, they can help you with leveling, and offer you the chance to make new friends, and also they can help you with group quests or dungeons.