I have a working knowledge of grammar, which is essential to all languages. If I ever decide I want to pay the price of becoming fluent in the Spanish language, I will have to submit to training. The same thing is true with loving. Some of us are taught how to love by our parents. Some of us don't get that from our parents, so we look elsewhere for training.
Books can help.
Workshops and seminars can help. Mentors can help. Sometimes counselors can be effective in love training but the Bible is our primary love-training manual because Jesus Christ models love. Near the end of his personal ministry, he knew it was time to leave this world. Whoever finds his life will lose it, and whoever loses his life for my sake will find it.