A chess glossary in three tiers. Two of them are meant to be read in order; the third is for looking things up.
Every board in this glossary is stored as one line of text. The board editor turns a line into a picture, or a position you place by hand into a line.
Search every term - including the precision notes, so searching pin finds skewer. Or open a category below and browse it. Words you look up once are marked look-up; words you have to be able to see say so, and knowing those is not the skill.