Hey Stan. My apologies, I just now saw your message (I generally just play the games and don't pay attention to much else on here).
As for tips, it's important to mark off everything that you know something cannot be. This will either be things that are explicitly stated in the clues (such as "Yolanda didn't wear the red shirt") or they can be inferred (Of Yolanda and the runner who wore a teal shirt, one finished with a time of 3:20 and the other drank Gatoraid). So you know that Yolanda didn't wear the red shirt, but she also didn't wear the teal shirt because that was another runner. We also know that the person who finished with a time of 3:20 didn't drink Gatoraid. So mark all of those off on the grid, cross off the clue about Yolanda not wearing a red shirt, and come back to the other clue later when you have more information from the other clues that may help you solve a previous clue.
Those are some fairly basic tips, but I hope that they help