This is the 498th most frequent Chinese word.
板
"板" means "board" or "plank."
Here, '板' is used as part of the word '黑板', which means 'blackboard', referring to the teaching aid used in classrooms.
老师把黑板擦干净了。
The teacher cleaned the blackboard.
In this sentence, '板' refers to a 'board' as in a flat, thin, rectangular piece of material, more specifically a wooden board.
他买了一块木板准备做手工。
He bought a piece of wooden board to make handicrafts.
Here, '板' is used in the compound word '滑雪板', which means 'snowboard', referring to the sports equipment used for snowboarding.