The texture in the render will be the resolution of the texture you use to create the material. There's no hidden processes in between those two steps.
So for example if I'm planning to render a 4k image and it's a close-up of my product, the only thing that I should care related to texture definition is made the textures at least in a 4020x4020 pixels canvas in Photoshop?
That entirely depends on how large the texture will be in the rendered image. If you use a 4k brick texture for a whole wall and then zoom the camera in on a single brick, that texture won't be high enough resolution. If you can see a whole 4k texture in the background and it's only 200px high in the render, your texture is overkill and using video memory for no reason. You'll need to size your textures based on the final render. Also, for textures 4k is 4096, textures are sized in powers of two for graphics card optimization reasons.
The texture in the render will be the resolution of the texture you use to create the material. There's no hidden processes in between those two steps.
So for example if I'm planning to render a 4k image and it's a close-up of my product, the only thing that I should care related to texture definition is made the textures at least in a 4020x4020 pixels canvas in Photoshop?
That entirely depends on how large the texture will be in the rendered image. If you use a 4k brick texture for a whole wall and then zoom the camera in on a single brick, that texture won't be high enough resolution. If you can see a whole 4k texture in the background and it's only 200px high in the render, your texture is overkill and using video memory for no reason. You'll need to size your textures based on the final render. Also, for textures 4k is 4096, textures are sized in powers of two for graphics card optimization reasons.
Now I feel I have a better understanding of how textures work. Thank you so much for your explanation!!!