How to Choosing maps to farming poe currency

When picking a poe map tier to farming poe currency, or when rolling a map, you might be tempted to go for the highest tier possible, or to roll the best pack size and quantity mods possible. 
Before you do this, please consider whether or not you’ll be able to clear it efficiently with your current character. It’s almost always better to pick a map where you can safely destroy most packs with a single ability. 
There are builds that scale very well with big packs due to corpse explosion mechanics like Detonate Dead or the Obliteration wand,Abyssal Cry, Profane Bloom or chaining AoE mechanics like Herald of Ice. 
These are just a few examples. Pick your poe maps based on your character’s strengths and weaknesses.

Linear map layouts, and other types of layouts that are easy to clear without backtracking are the best. You may think that running a Torture Chamber, Crematorium or Shrine is a good idea because they’re red maps, but they are awkward to navigate, and will take a lot longer to clear than Mesa, Dunes, Canyon, Oasis, Tropical Island, Strand, Mud Geyser, Atoll, Plateau, etc.

When rolling maps, I generally just alch a bunch of maps, then check them all for mods that my character simply cannot run, and then for combinations of mods that would make the map very uncomfortable or unsafe to run. I Scour and Alch unwanted map rolls, but if you have a huge chaos stockpile, it is faster to use chaos for rerolling. Get to know your character’s strengths and weaknesses, and eventually you’ll be able to tell at a glance if a map is good for you or not. Don’t fall into the trap of wasting too much time and poe currencies to try to roll the best possible map.

Depending on who you ask, some people swear by chiseling to 20% quality, overlapping sextants and doing various Zana mods to maximize pack size. I find these to be entirely optional, and will not go out of my way to buy them if I run out of the required resource. On a related note, keep at least 3 copies of each map with an ele or phys reflect mod that you’d normally not be able to run in case you get the sextant mod that makes players not take reflect damage. If your character is not at all worried about reflect for some reason, then this doesn’t apply to you.

If I have a huge surplus of maps I might even run a few blue ones in rapid succession. These drop a lot less loot, but that also means you spend less time looting and can clear them faster.

Shaping the Atlas:
You can pick and choose which maps to complete on the atlas to manipulate which maps will drops for you. There are several guides out there for this already, and multiple variations so I won’t go into too much detail on this part. The method I’ve tried and enjoyed is simply:
*Complete the bonus for all T1-T9 maps.
*Get at least 1 Shaper’s Orb to shape the tiers 5, 6, 7 and 8, making these maps your ONLY tier 10, 11, 12 and 13 maps.
*Complete all Unique maps
*DO NOT complete any T10-T13 maps unless you need them for a Shaper’s Orb. If you’ve killed the boss in a map, that map can drop in the appropriate level range, even if you didn’t complete the atlas bonus, so you really don’t want to run them at all.
*Complete the bonus for all T16(guardian) maps and Shaper. (You can buy completions for these if your character is unable to solo them. Just go to /trade 820 and keep an eye out for completion sellers)
*You’ll have to use Cartographer’s Seals on your Colonnade, Excavation, Estuary and High Gardens maps after getting their respective shaper’s orbs, since you don’t want these to drop instead of your shaped maps of choice.
*Rather than trying to progress naturally through the atlas, you can start buying the specific maps you need to complete once the market has been established a bit. Until that time, you can just run low tier maps or Merciless Dried lake.
*You can complete all T14 and T15 maps for more atlas bonus, OR you can leave those uncompleted and shape a T9 and a T10 into T14 and T15 so that only the shaped variants of those tiers can drop. There are also other variations you can do, but I’ve already gone into more detail than I wanted to in this section.

Which maps you decide to shape is ultimately up to you. In this atlas I have chosen Mesa, Strand, Mud Geyser and Atoll.

You can make a lot of currency by selling all Tier 14, 15 and 16 maps you get. Try to sell them in bulk for maximum efficiency.

Find a method that works for you. As long as you are able to speedrun maps in 3 minutes or less, and sustain your desired map pool while still earning lots of currency, you’re probably not doing it wrong.