581: Circle of the Land at 2nd level on a short rest you can regain spell slots equal to half your druid level, with no spells higher than sixth, but only once per long rest. 6h level Nonmagical difficult terrain costs no extra movement, and advantage on spells that impede movement with plants. 10th level can't be charmed or frightened by elementals or the fey and immune to poison and disease. at 14th natural beasts and plant creatures have to make a wisdom save to attack you.
The book gives examples of Wolf at 2nd, Crocodile at 4th, and Giant Eagle at 8th
582: I don't believe so, no
586: 1st Faerie Fire, Sleep
2nd: Calm Emotions, Phantasmal Force,
3rd: Blink, Plant Growth
4th: Dominate Beast, Greater Invisibility
5th: Dominate Person, Seeming.