Easy patterns are single-rule sequences. You see 3, 6, 9, 12 — each number is 3 more than the last. Or 2, 4, 8, 16 — each doubles. The rule stays the same from start to finish, no twists.

These are a good warm-up because they teach you the core technique: look at how each element relates to its neighbors. Once you're comfortable spotting constant differences and ratios, move to medium where the rules start mixing.