When enemy air approach use a Defilers Dark Swarm around your Hydralisks rendering
them impervious to the enemy air attacks
Initially build Zerglings and Hydralisks but remember
that they are at the
disadvantage against Zealots and Firebats
Guardians are a strong attacking force as long as they keep their distance from
the target and are able to retreat if need be
Use Nydus Canals to connect bases because units would instantly be transported
to another base to attack or defend
Scourges are very effective against Carriers or Battlecruisers
Build a perimeter of Sunken and Spore colonies around your base to keep up the
defense
When attacking an enemy base with Zerglings attack structures rather than units
Strategically place Lurkers around bases to create a strong defensive line