I'm a gardening newbie and I hate lawn maintenance.

I was told that instead of spending $$ on fertilizer and/or
weedkillers, if we spread grass seed on the lawn regularly it will
take care of the health and thickness of the lawn. Also since there's
no place for the weeds to grow, they won't.

Does anyone use this concept? Does this work? It looks too easy and
simple to be true.

Thanks.