How do I minimize redirects?

Hi, I was hoping someone can help me with this. I have been trying to sort out things on my website to try and improve the speed. Typically it seems that something has happened to make it worse. Since today, I have started getting 'minimize redirects' suggestions in both Pingdom Tools and GTmetrix, which I have never had previously. And from the links it gives me, I have no idea where to find these or fix them. Any advice would be appreciated! Thank you.