Tools are an incredibly important part of our work. Great tools allow us to look at the systems we're developing, get a holistic sense of what's going on and then zoom into the details we care about.
Today PIX on Windows announced its beta release. If you work with D3D12 on Windows, you definitely owe it to yourself to take a look - you can start with the documentation or the videos. There is a lot you can get from these tools, so investing some time learning how to use them well is a good investment.