建 means to build (a structure) and is a JLPT N4 kanji. It has 9 strokes and uses the long stride radical (廴).
Stroke order · 9 strokes
On'yomi (音読み)
ケン、コン
Kun'yomi (訓読み)
た(てる)、
Radical
廴 · long stride
Strokes
9
How to remember 建
聿 (a brush/pen) + 廴 (a long path): drawing up a design with a pen and raising the building step by step. 建物 (tatemono) = building, 建てる (tateru) = to build.