River classification is an interesting topic in physical geography because rivers can be categorized according to different characteristics.

One common approach is to classify rivers according to their flow.
Perennial rivers generally have water throughout the year, while seasonal rivers experience major changes in flow during wet and dry seasons. Ephemeral rivers flow only temporarily, often following rainfall.
There are also geographical classifications based on how river courses develop. These include antecedent, consequent, subsequent, and superimposed rivers.
These classifications help explain how rivers interact with climate, geology, slope, and surrounding landscapes.
For anyone studying physical geography, understanding these categories can make topics such as drainage systems and landform development easier to understand.
I found this detailed reference useful for reviewing the different classifications and characteristics of rivers:
https://thecampusreview.com/geography/types-of-rivers/