Here are some ways to earn gold in Diablo 4 Beta:

1. Complete Side Dungeons: Dungeons are a great way to earn gold in Diablo 4. You should aim to defeat the final boss and kill most of the mobs to get the maximum gold reward. There are 23 dungeons in the game, and a single dungeon can easily earn you thousands of D4 gold.

2. Complete Cellars: Cellars are bite-sized versions of dungeons where you fight a single minor boss and a few minions. While the D4 gold reward is not as substantial as dungeons, they are much quicker to complete, so you get a decent gold return for a smaller time investment.

3. Complete World Events: Keep an eye out for orange triangles with three dots on your mini-map, which denote world events. These usually involve fighting a small boss, destroying effigies, protecting NPCs, or fending off waves of minions. While these events should not be your sole focus when hunting for gold, they provide decent rewards, including XP and gear that can be sold for gold.

4. Complete Side Quests: There are 35 side quests in the Diablo 4 beta alone, and this number is expected to increase significantly upon the game's full release. These quests tend to reward players with a hefty stack of gold upon completion, and they don't require a significant time commitment. Look for blue exclamation marks on the map to find side quests.

5. Sell Gear for Diablo 4 Gold: You will come across a lot of gear in Diablo 4, but most of it is worthless. However, you can sell any item you don't need at the weapon and armor vendors in towns and cities for a decent profit. Rare and legendary items fetch the most gold, but every little bit helps.

6. Roam and Explore: Exploring the world of Sanctuary is a reliable way to earn gold in Diablo 4. Keep an eye out for chests, casks, tree chunks, and loose stones, and take on any enemies you encounter. Even just 15 minutes of exploration can earn you a few thousand D4 gold.