KanjiJLPT N2
Plan

plan, suggestion, draft, ponder, fear, proposition, idea, expectation, worry, table, bench

Mnemonic

To draft a brilliant plan, first relax beneath a tall tree. Let the dappled shade quiet your racing thoughts. As you relax, ideas drop like ripe fruit from the tree above—each one a piece of your plan clicking perfectly into place on the grass around you.
Additional thoughts
Picture yourself leaning against the trunk, eyes half-closed, a notebook on your lap. The calm (relax) plus the natural setting (tree) together produce the plan. 安 on top of 木.
Quick recall
Relax under a tree and let a perfect plan fall into your lap like fruit.

Details

The keyword for 案 is plan. This kanji refers to a thought-out proposal, scheme, or idea that has been devised for a particular purpose. It can also mean a draft or suggestion, as in a preliminary version of something being considered. Additionally, it carries the sense of expectation or anticipation, as when something turns out contrary to one's plan or assumption.
On'yomi
あん
Kun'yomi
つくえ