一 (yī) is Kangxi radical no. 1, “one”. In this form it is written with 1 stroke.
As a radical, 一 (yī) is the part a dictionary files these characters under. Often it hints at the meaning - “one” - but sometimes it is only a shape that the character happened to share.
The characters range from 1 to 7 strokes. 10 of them already appear in HSK 3.0 levels 1–2, and 9 have a full word page of their own.
Good ones to start with: 一 (yī) one, 七 (qī) seven, 三 (sān) three, 上 (shàng) up / above / on.
All characters · 丨 (gǔn) →
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