To get the review about the movie it is fine that you call up your friends and ask them about the various things that would motivate you to go out for a movie. About the beautiful places in the city that you want to visit also you could get in touch with few of your friends who were staying in the city for quite a long time. However, for addressing the weeds you could not ask your friends as they may not have any interest in growing plants or the lawn due to which they would have never encountered the problem of weeds. The other possibility is that they could have employed a gardener who might be taking care of weeds by buying the weed killers and just asking his owner to reimburse the money or pay for the bills that get delivered home.
So, you should rely on the weed killer Guide that is easily accessible online and could provide you enough knowledge as to what has went wrong with your lawn or why has your plants look dull and what needs to be done with the various weeds that has in the resulted in the situation that you are facing currently. No wonder, you would get more inputs and a big list of weed killers but which one would be most applicable for your use case should purely be decided by you only after having understood the dimensions of your lawn, the thickness of the grass or vegetation that you are growing in the lawn and so on.
Now that you know different options you could easily pick the best out of this collection, get to know how to apply them according to the frequency that is suggested by the manufacturer and thus could keep your lawn as clean as what would have been maintained by a trained gardener.