Naming things it's a hard task. Once you named something in the system, you want to follow this naming convention. Especially it's important if term comes from domain experts

One technique for doing classification is called K Nearest Neighbors or KNN. To use the algorithm you need to have some data that you’ve already classified correctly and a new data point that you wish to classify

Query Objects (also referred to as queries) is another pattern that helps in decomposing your fat ActiveRecord models and keeping your code both slim and readable

Having confidence in your application helps with the aid of great interation tests. For Rails, that means utilizing the Capybara gem for testing features from end-to-end