When you were chirdern, how did you learn new English words?
We had books & stories with vocabulary lists，Textbook，Passage.We also had vocabulary assignments in school.We were given a list of words that we needed to look up in the dictionary Antonyms,Synonyms,Construct sentences.
We looked up answers on Quora. Adults learn new words through reading and social interaction.
When you encounter a new word, you can often infer its meaning from the context.Don't just memorize vocabulary lists.They don't give you the context.You might know the meaning of the word without retaining or internalizing it.Vocabulary words are the building blocks of your language ability, but don’t be obsessed with just memorizing vocabulary.It’s more useful to know how to use 50 words than to memorize 100.
Read things you’re interested in or will use.You don’t have to read classical novels. Charles Dickinson,Jane Austen,Broadsheet newspapers such as New York Times or the Wall Street Journal might not be suitable either.The content might not be the most practical or useful to you.The language might also be too difficult.You might need to check 80% of the words you're reading.It disrupts the learning flow.
Content where you don't understand 20% of the words is the most helpful.It means you can pretty much infer new words from the context.Pay attention to the sentences where the new words occured so that you know how to use them.Define reading in broader terms.Find content that motivates and matches your interest and hobbies.High frequency content,Even work-related topics could be fun to read.Check American news portals,Current affairs/events.
I learn a lot of new words from listening to podcasts.NPR has a many great podcasts.On Point. It covers a wide range of topics.You will learn a wide range of things and words and natural expressions.
I kept a notebook when I was in school,I'd write down new words every day,I'd write down each word and its definition for a few times to help me memorize,I'd also write down the sentence where the new word was used,It helped me internalize the new words.