It very difficult to describe how to use "才”, only one hanji doesn't make sense.
In general, the most common expression is " 刚才” ,which means just moment.Another one is "才华“ which means talented, versatile. we can't understand "才" separated from a word or a sentence, as what I said, we learn “刚才”,“才华","这东西很便宜,才用了两元”“昨天才来”,etc.
I hope it would help you.