With the kinda sorta but not yet announcement of the Diablo 3 expansion more people are coming back to Diablo 3. Here’s some information and helpful links that you can click and find the answers to your questions. Feel free to ask any questions you can’t seem to find the answer here and myself or anyone else able to will answer your question. This will be updated with more information as it seems fit.
All of this information is either listed on the /r/diablo wiki which you can find HERE or on the class specific subreddit. If you want more in depth information about any of the classes, check their subreddit and their sidebar
Here are the condensed patch notes with links explaining what each change means
Overall helpful tools:
Gold making from square one
Flipping Items – Flipping items means buying an item with the intention to sell it for more than you bought it. This isn’t easy and can be risky.
Max stats possible per item slot
Best farming routes currently
Diablo 3 acronyms
d3up – Breaks down how much DPS (Damage per second) and EHP (Effective health points) you get from each piece of gear and each skill. Great for comparing items to see if it’s worth the gold or money to buy the item. If you need help you can always send a message to /u/JestaC who is the owner/creator of D3up. You can also check out /r/d3up
diabloprogress – Great for seeing what high end items people are looking to sell and how high people can get their dps/ehp/etc (Note: Just because a person has 1 million dps doesn’t mean that it’s a good idea to copy them)
D3RMT – Shows different trends for the AH based on data collected. Shows if you should sell or buy or sit on your gold/items.
Power leveling guide – /u/MostlyFeralCat Was nice enough to write a power leveling guide (A bit out dated at this point, but most of it is still correct) to help you either get power leveled or level up your friends coming back to the game.
Class specific information
Barbarian:
Here is the Barbarian specific subreddit: http://www.reddit.com/r/Diablo3Barbarians
Optimal Gearing slot by slot (If you can’t afford the best items try to look for items with similar stats/same stats but less.)
Fury Management 101 – tips and tricks
General barb building guide
HOTA/WW Guide
Demon Hunter
Here is the Demon Hunter specific subreddit: http://www.reddit.com/r/Diablo3Demonhunters
Gearing
Rapid fire build
Cluster grenade build (high MP farming)
Perma-strafe build
Bola Trap build
Monk
Here is the Monk specific subreddit: http://www.reddit.com/r/Diablo3monks
The /r/diablo3monk wiki is probably the best wiki out of all the diablo related subreddits it’s extremely organized and very detailed and will answer almost any question you have and help you from making 100,000g builds to 500million gold builds.
Their wiki is here
Backlash (DW)
Speed Palm (DW)
Triple Generator Build (DW)
High MP Tempest Rush (2-Hander or Dual Wield)
Tempest Rush (low to Mid MPs) (2-Handed)
Group Builds
Wizard
Here is the Wizard specific subreddit: http://www.reddit.com/r/Diablo3wizards
CM/WW Build Guide
Archon Build Guide
Blizzard Build Guide
Witch Doctor
Here is the Witch Doctor specific subreddit: http://www.reddit.com/r/Diablo3WitchDoctors
Beginners guide to WD
Stats and Gear
Common Builds
Feel free to correct me or tell me what you think needs to be added or taken away.