How do fluent English speakers learn the vocabulary and grammar rules?
Recently I feel it hard to raise my English to the next level. I feel very frustrated memorizing more advanced vocabulary and understand more fancy grammar rules... For example I came across with the word "electroencelphalogram" today, and I realized that I had to know the meanings of differect sections (is there a term for the sections, btw?) to fully understand this word. I think it's because of the lack of familiarity of prefixes and suffixes, right? Could someone please help me out and tell me what I can do, please?