For all chainsaws, one of the most important parts of maintenance is keeping your chain sharp and replacing it long before it has the chance to break – which can lead to a very dangerous situation of the chain whiplashing back towards you. The chain should be properly oiled and tensioned before using your saw, and you can either sharpen it yourself or take it to a professional to keep it working as it should.
There is additional saw maintenance if you have a gasoline-powered saw, since the engines require some care to keep them running. The motor needs to be oiled from time to time, as well as kept clear of sawdust and other debris. When in doubt, have a professional service your chainsaw engine.