Great!! well said and written and I totally agree with you on this.
Focusing on learning a particular aspects really will help alot for sometimes if you try to learn all you'll find it difficult from identify some words or maybe misusing them unintentionally. Practice they say makes perfect, if you don't practice how else do you want to be perfect. Practicing what is actually relevant to your life also helps, for you'd be more focus in learning it and also it'll have to do with your day to day activities and thoughts.