easy to learn but difficult to master

Although the basic concepts of programming are easy to learn, mastering them to a professional level is difficult.

尽管编程的基本概念很容易学习，但要达到专业水平则很难。

Learning to play the piano is easy, but mastering the instrument requires years of practice.

学习弹钢琴很容易，但要精通这种乐器则需要多年的练习。