Sourced, honest, no affiliate links.
A pile of colourful interlocking plastic building bricks.
Reference: loose building bricks. Not a specific set from this site. Photo: Alan Chia, CC BY-SA 2.0

What you need

First project

A small, single-bag set with under 200 pieces, built step by step without skipping ahead, so you learn to read instructions and sort by step.

Common mistakes