Language learning is related to memory. So once you start learning language you realise that you need to learn a huge amount of new words. So here are some methods people use.
Some people put new words in various groups. They design group titles in categories that make sense to them. For example words for the kitchen, or words for action, or words for explaining. The title of your group can be anything and then you have the words and examples of how those words work. Grouping is a very useful way for language learning.
This picture is camping in Algonquin park. A canoe and the lake.
Make your own language book
Many language learners make language books that work for them. They use these books to constantly expand their vocabulary and also to review new words. The advantage of making your own book is that you have designed a book which is useful for exactly you. These kinds of language learning books are much better than books which you buy at the store because those books are not written for you. They are very general and contain a lot of stuff which you don’t need.
So two ways of language learning are called grouping and also making your own language book.