This is the 384th most frequent Russian word.
вещи
"Вещи" means "things" or "items" in English.
Here, 'вещи' refers to physical objects or possessions belonging to someone.
Эти вещи принадлежат моему брату.
These things belong to my brother.
In this sentence, 'вещи' metaphorically refers to abstract topics or areas of knowledge.
Она поразительно разбирается в таких вещах.
She has a remarkable understanding of such matters.
This use of 'вещи' pertains to notes or personal materials relevant to studying or learning.