Ranger Features: Favored Quarry & Favored Terrain

[Kane0]

Favored Quarry
(Level 1 Ranger Optional Feature; Enhances or Replaces Favored Enemy)
You choose a type of favored quarry (which must match your Favored Enemy choice(s) if you have that feature)

Favored Terrain
(Level 1 Ranger Optional Feature; Enhances or Replaces Natural Explorer)
You choose a type of terrain, which must match your terrain chosen for Natural Explorer if you have that feature.

I would go with 'replace' so things don't get cluttered

Going over the Favored Enemies, there's some good stuff in here. If I may make some suggestions? Apologies if i'm not as verbose.

• Aberrations: You have advantage on saving throws to end ongoing effects.
• Beasts: Beasts are never initially hostile to you, and you can add your Charisma bonus to Wisdom (Animal Handling) checks.
• Celestials: You learn Detect Evil and Good as an extra spell known. You can cast it once without expending a spell slot and without requiring concentration, regaining the ability at the end of a long rest.
• Constructs: You can attempt Charisma-based skill checks against creatures bound to obey another’s will even if you share no language and would otherwise be unable to understand you.
• Dragons: You can track creatures that don't leave visible trails (such as flying or swimming creatures) at no penalty,
• Elementals: You learn Arcane Weapon (Artificer 2019 UA) as an extra spell known. You can cast it once without expending a spell slot, regaining the ability at the end of a long rest.
• Fey: You can automatically tell when a creature is Charmed or Frightened.
• Fiends: You learn Protection from Evil and Good as an extra spell known. You can cast it once without expending a spell slot and without requiring concentration, regaining the ability at the end of a long rest.
• Giants: You can move through other creatures’ spaces freely, without spending extra movement.
• Humanoids: You learn Detect Thoughts as an extra spell known. You can cast it once without expending a spell slot, regaining the ability at the end of a long rest.
• Monstrosities: When you cast a spell a Monstrosity type creature counts as a Beast or Humanoid type creature for the target of the spell.
• Oozes: You gain resistance to Acid damage, and can squeeze through spaces as if you were one size category smaller.
• Plants: You can notice creatures that are normally indiscinguishable from normal plants or mineral formations and can use the Hide action with a Disguise Kit to assume the appearance of a plant.
• Undead: Your hit point maximum cannot be reduced and when making Death Saving Throws you die after five failures instead of three.

Regarding Favored Environment, I can see that most involve a damage resistance. This is cool, but I think each should match the damage type dealt by dragons that usually live in each region and Favored Enemy shouldn't also give you a resistance that could clash. Perhaps something like the following:

Terrain Adaption
When you finish a long rest you gain resistance to one damage type according to the terrain you finished resting in, which lasts until the end of your next long rest.
Coast/Aquatic: Thunder or Lightning
Arctic: Cold or Force
Desert: Fire or Radiant
Plains/Forest: Piercing or Poison
Highland: Fire or Cold
Swamp: Acid or Poison
Underground: Necrotic or Bludgeoning
Urban: Psychic or Slashing