～が好きです・～がほしい

In Japanese, to say you like something, you use the pattern [Noun] が 好きです. Unlike the English word "like" which is a verb, 好き (suki) is a na-adjective. Therefore, the object of your liking is marked by the subject particle が (ga) rather than the object particle を.

To say you want a physical object, you use the pattern [Noun] が ほしいです. ほしい (hoshii) is an i-adjective. Similar to likes, the desired object is marked by the particle が (ga) instead of を.