I would say to read a lot. You learn passively through reading, which means that you learn without trying. There are 3 distinct ways to learn: reading/writing, listening, and talking. Reading is the one that I consider to be the best (my opinion). When reading, you increase your reading speed, learn to recognize words, learn words in context, and eventually, store new words in long term memory. For instance, I am learning Spanish. I can read about 20,000 - 30,000 words a day now. In order to speak or listen to that many words, I would either have to talk all day or listen to someone else talk all day. Plus I would also have to recognize every word and understand the context to figure out what is being said, but if that person is telling a story and I miss a part of it by not understanding, I will be lost for the rest of the story. When reading, the story will wait for you to gain understanding. I actually use a great site called lingq.com for this. It allows you to either learn from lessons that other people have put up, or just jump straight to uploading your own private content, so I can just load news articles or stories from ebooks in and just start reading. It tracks words you know and don't know and has a quick lookup feature so you don't have to take a long break from your story to figure out what a word means. Hope this helps!

Thank you for your advices and correction ☺️

I'd guess read a lot, watch English programmes a lot, to get ideas & practice a lot to get familiar with using the expressions you learn. BTW: "How to ..." is not a question. Tell me how to .... How can I ...? Sorry, English is nowhere near as flexible as Chinese.