A good way to learn more English words is to study one new word every day.  Here is a good website – The Britannica Dictionary (Previously called “Learner’s Dictionary”) that teaches you a new word or common expression every day. Start Today!
To make it easier to use on your phone or tablet, put a website shortcut button on your home screen that will go right to the Word of the Day.  Here’s one way of how to do that for Apple and Android.