This is the 2464th most frequent Russian word.
поста
The Russian word "поста" can mean "post" (position, station, or role) or "fast" (religious abstinence), depending on context.
The word 'поста' here refers to 'fast' in a religious or dietary context.
Во время поста многие люди отказываются от мяса.
During the fast, many people refrain from eating meat.
The word 'постов' (genitive plural form) here means 'posts' as in blog entries or messages in an online space.
Он выложил несколько постов в своём блоге.
He posted several entries on his blog.
The word 'поста' here means 'post' in terms of a designated location, like a guard post.