So i downloaded DaVinci Resolve and its doing this:
It can't load files and starts lagging whenever I add a file to the timeline. My hardware is strong enough to run DaVinci Resolve.
It may be worth you doing a Forum Search for "DaVinci Resolve", as we see a number of questions regarding that not working here on the forum, including: Unable to load DaVinci Resolve home page
You say your PC hardware is strong enough, but can you tell us your hardware spec and graphics card.
In the start of the video there is a neofetch
It would have helped if you simply posted a screenshot here instead of us having to do that from your video.
I for one do not use DaVinci Resolve so cannot help.