This is the 9021st most frequent Japanese word.
浅い
Shallow.
浅い is used to describe the physical depth of the water.
この池の水は浅いです。
The water in this pond is shallow.
浅い is used metaphorically to describe the level or depth of a person's understanding or experience.
彼の知識はまだ浅いです。
His knowledge is still shallow.
浅い is used to describe the early stage of time during the night (metaphorical use related to time progression).