Fastest method for badges, the medium badge is accumulative not total so don't worry about spending. You will hit easy going for medium.
Active: Play Bureau of Questing or Golem Factory quests, the quests last 20 seconds making the them the fastest for getting gold. Focus on guildhall upgrades (Under company) and buying as many players as possible. Only add enough members to a quest to ensure success, heal as needed.
Idle: Academy of Wizard quests provide roughly half of the gold the "Shady Market" provides per quest, but given the amount the Academy is 20 minutes and the Market is 2 hours... It's up to you and your situation. I suggest Academy of Wizards. Do the same, guildhall upgrades and buy as many members as you can. Make sure success is 100% heal as needed.
Upgrading the tavern may help but classes don't seem to help enough to matter in the short term.
Nice game bro.
Got a little bit of that aesthetic.
Pixels.
Just like I like em.
Yeah got that idle.
Drinks, college homework, game.
Check.
Yeahh thats the stuff.
Nice game.
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 "Realm Grinder"){kind=icon}