When it comes to Classic, Blizzard's goal is to provide an authentic Vanilla experience, but they also needed to come up with technology to handle many players at launch, which is similar to sharding. While the use of this technology will be limited to the first month following launch, many players are questioning this decision and wouldn't like to see layering in the game at all. 

You can also make good gold for opening lockboxes, park yourself in a public place like Ironforge Commons or Orgrimmar near the Auction House, and let Trade Chat know you’re available.  You can even make gold by offering to stealth in and pick the Shadowforge Lock open in Blackrock Depths!  You’ll need to level up your lockpicking though, so work hard on it like any other profession. Try Redridge, Wetlands, and near the coastal nagas in Ashenvale.

Recruit-A-Friend (RAF) is heading into the workshop! The longstanding RAF program is going on hiatus while we construct something new that makes it even more rewarding to introduce your friends to World of Warcraft. As of June 11, 2019, the current program will come to an end, and you’ll no longer be able to send new RAF invitations. Don’t worry though—the program will be back in its new form before you know it.

It’s important that you levelling in certain areas around your characters level to gain the full XP reward for slaying monsters. Below is a list of all the best location for grinding XP from level 1 to 60, these locations are good for AOE spells and should have plenty of mobs. The Level you should be before you enter that specific location will be indicated to left in a Blue Color for Alliance [Lvl 35-39] and Orange Color for Horde  [Lvl 35-39] the Mobs you are looking for Bolded [Mob Name].
Only really to expand on Gráinne's comment as regards the 'collecting' and 'roster development' sections - which are, as said 'distinct' although they are intrinsically linked - I would like to point you in the direction of the in-game Achievements > Battle Pets > Collect tab. There are a series of achievements called Raiding With Leashes, pretty much all of which can be completed via the auction house - if you have the gold/inclination - or by completing old raids.
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