Good At
Skilled At, Strong Point, Specialty, Forte
noun, な adjective, の adjective
When you're able to acquire ideas at a fast rate, you must be familiar with whatever it is you're doing. If you acquire ideas in this way, there's a good chance you're good at or skilled at this action.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
一番得意な料理は何ですか。
What is your specialty dish?
ダリンはプログラミングより山登りの方が得意です。
Darin is more skilled at mountain climbing than programming.
コウイチもビエトも、サルサはあまり得意ではない。
Neither Koichi nor Viet is any good with salsa.