Based on https://www.youtube.com/watch?v=s9C7JdSRZGc

number of lands

33-35 lands for lower curve
38+ lands for midrange curve
more lands for more colors in the deck
e.g., ~35 lands for mono color medium range

Mono color decks

25-30 basic
8-10 utility
3-6 mana rocks

Two color decks

1 Command Tower
8 fetch lands, incl. prismatic vista
1 OG dual land
1 shock land
1 battlebond land
1 slow land
1 pain land
1 check land
1 pathway
1 filter land
1 horizon or tango land
1 ravnica bounce land
10-14 basic lands
6-8 utility lands
5 mana rocks (sol ring, arcane signet, talisman, signet, thought vessel or mind stone)

Three color decks

3-4 untapped rainbow lands
1 triome
10 fetch lands incl. prismatic vista
3 og dual lands (or 3 pain lands)
3 shock lands
3 battlebond lands
3 slow lands
1-2 horizon lands
7-10 basic lands
4-6 utility lands
5 mana rocks (sol ring, arcane signet, talismans)

4/5-color decks

5 untapped rainbow lands
all 11 fetch lands
3 triomes
6 or 10 OG dual lands
3-6 shock lands
2-3 battlebond lands
1-3 horizon lands
5-7 basic lands
2-4 utility lands
1 sol ring
1 arcane signet
6+ green mana accelerants