This is the 18022nd most frequent Russian word.
фишечки
Small features, tricks, or quirks.
Here, 'фишечки' refers to 'features' in the sense of small, innovative details that enhance usability.
Этот новый телефон имеет много полезных фишечек.
This new phone has many useful features.
In this sentence, 'фишечки' is used to mean unique or clever techniques or tricks in programming.
Мне нравится читать статьи про интересные фишечки программирования.
I enjoy reading articles about interesting programming tricks.
Here, 'фишечки' refers to 'tricks' or skills that are unique and entertaining, often used in a showy manner.