This is the 3388th most frequent Russian word.
пособие
Benefit, allowance, or aid; also, a manual or guide.
In this sentence, 'пособие' means an educational material or guide, commonly a textbook or study aid.
Я купил новое пособие по математике.
I bought a new math textbook.
Here, 'пособие' refers to a financial assistance or benefit, provided by an organization or authority.
Государство выплачивает пособие по безработице.
The state pays unemployment benefits.
In this context, 'пособие' denotes a guide or manual designed to teach or instruct on a particular topic.