Crafting Maps: first, look in the Codex > Dictionary > Map. then read all of the affixes so you can have an idea of what there is. some of the affixes are more beneficial for Farm Builds than others. one of the affixes is Enemy Affix, which gives monsters extra affixes. most are bad for you, but there are 2 that are good for Farming. Experienced gives +100% Experience from that monster, and Gracious gives +200% Items Dropped from that monster.
Larimar & Diamond Crystals can be used to change affixes on Maps, but not Eternal Maps. Larimar randomly changes the affixes on a Map to other affixes, but not the number of affixes. Diamond randomly changes the values for all of the affixes at once, not one at a time.
Perks: for a player getting Perks for the first time, Accomplished, Fortunate, & Dealer are usually the first 3 Perks chosen, in the order of your choosing. Enshrined, Treasured, & Hunter are the last 3 usually chosen. I went with Accomplished, Fortunate, Enshrined, Dealer, Hunter, & Treasured.
you should first read the description of the Perks in the Codex and then consider what your Goals are while your are Ascending for Perks. my Goal was getting the most Experience possible, and better Loot second so I could improve my Ascending Build as I Ascended for the Perks. all my other Goals could be worked on after I got all of the Perks. get Perks in the order that helps you meet your Goals the best while you are getting them.
Speed Killing Monsters: this is not really a contradiction. at higher floors + higher difficulty, it gets increasingly harder to kill the monsters fast. that is why you don’t want to use Farming or Ascending Builds on higher floors. some players have mentioned that their Farm Build can go to floor 1500-2000 on M3 and smash monsters, and that’s ok. but you don’t really need your Farm Build to go much past floor 500 of any Difficulty for Farming, unless you want to use your Farm Build to get Items that are only found on floors up to 1000. and there is a noticeable difference in the loot you get from a monster you kill quickly versus a monster that takes awhile to kill.
the reason I mention floor 500 is because at floors 100, 200, 300, 400, & 500, the higher Tier Crystals & Myth Stones become a little easier to get, but at the cost of not getting the lower Tier CS & MS. no Calcite at floor 100+, no Angelite at floor 200+, no Quartz at floor 300+, no Diamond at floor 400+, and no Larimar at floor 500+.