This is the 734th most frequent Russian word.
пост
The Russian word "пост" can mean "post" (as in a position, assignment, or publication) or "fast" (as in a period of fasting).
In this sentence, 'пост' refers to a period of fasting, commonly for religious reasons.
Я решил соблюдать пост в этот месяц.
I decided to observe the fast this month.
Here, 'пост' means a job position or role in an organization.
После окончания армейской службы ему предложили пост начальника.
After completing military service, he was offered the position of director.
In this context, 'пост' refers to a duty post or area of responsibility.