This is the 3849th most frequent Turkish word.
şeyleri
"Şeyleri" means "things" (in the accusative or plural possessive form, depending on context).
Here, 'şeyleri' is used as the object of the sentence, reflecting the things that are difficult to understand.
Bazı şeyleri anlamakta zorlanıyorum.
I have difficulty understanding some things.
In this sentence, 'şeyleri' indicates unspecified items that were forgotten during an activity.
Eşyalarını toplarken bazı şeyleri unuttu.
He forgot some things while packing his belongings.
Here, 'şeyleri' refers to various unspecified items or activities being tried.