Two, Piccolo killed him in season 1 with a Special Beam Cannon, then Cell did in I believe season 6 when he blew himself up.
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Frieza does not get killed by Goku. Future Trunks is the one to kill Frieza.
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In DragonballZ we saw Goku killing Yacon, monster pet of Babidi and Kid Buu with Spiritbomb. These two are only which he killed himself. (Though Spiritbomb is made of all creature's energy).
The answer is........................................... simply no. Goku knows Super Saiyan 1,2,3, and 4, and Bardock never knew any of those.
goku turns into super saiyen after freeiza full power killed krillen. goku needs to get angry to turn into super saiyen