What's the meaning of the song blowin' in the wind?

Blowin' in the Wind" is a song written by Bob Dylan and released on his 1963 album The Freewheelin' Bob Dylan.
Although it has been described as a protest song, it poses a series of philosophical questions about peace, war, and freedom without supplying concrete answers.

"Blowin' in the Wind" has been described as the anthem of the 1960s civil rights movement. In Martin Scorsese's documentary on Dylan, No Direction Home, Mavis Staples expressed her astonishment on first hearing the song, and said she could not understand how a young white man could write something which captured the frustration and aspirations of black people so powerfully.

Pete Seeger who first identified the melody of "Blowin' in the Wind" as Dylan's adaptation of the old Negro spiritual "No More Auction Block". According to Alan Lomax's The Folk Songs of North America, the song originated in Canada and was sung by former slaves who fled there after Britain abolished slavery in 1833. In 1978, Dylan acknowledged the source when he told journalist Marc Rowland: "'Blowin' in the Wind' has always been a spiritual. I took it off a song called 'No More Auction Block' — that's a spiritual and 'Blowin' in the Wind' follows the same feeling."

Dylan's performance of "No More Auction Block" was recorded at the Gaslight Cafe in October 1962, and appeared on The Bootleg Series Volumes 1-3 (Rare & Unreleased) 1961-1991

Source: Wikipedia

One can understand many of the stock-standard philosophical questions by breathing in various pollens.

I think it means that Bob Dylan is the best singer/songwriter EVER!

Its a song about why we don't anticipate or understand fate or as a dichotomy that which we create or know is manmade or predetermined by others including politicians or humans or even God.