Is it possible to create high-quality videos with the highest possible timeline resolution? What are your general settings?
Ideally, you should be able to work at the output resolution.
It also depends on how precisely you want to be able to see the view while editing.
The timeline resolution has an effect on the response during work.
For this reason, the timeline resolution may be lowered. However, if you deliver it as it is, it will naturally be a low-resolution work. Changing the settings on the Deliver page to a higher resolution does not produce the desired result, as it is a process of upscanning from the timeline resolution.
Even if you lower the resolution of the timeline, there is a way to avoid quality deterioration.
Change the resolution of the timeline immediately before delivering, and then deliver.
By doing this, everything on the timeline will be processed assuming the new resolution setting.
Rendering is also re-rendered based on the changed timeline resolution and the file is exported.
However, it may not be a good idea to lower the resolution of the timeline first to make it work comfortably.
Optimized media, proxy media, and the mechanism for lowering the resolution of these media can be found in "Optimized media & render cache" in the master settings of the project settings. First of all, I think it's common to specify the final resolution for the timeline resolution and try optimized media and proxy media.
There are multiple methods, and depending on the material used and the PC environment, there are parts where you do not know which one is the best until you operate it.
Experiment and see what works best for you.
This area may be one of the deep parts of DaVinci Resolve, which is used even in the movie environment.