Quick and very helpful tool:
is your model very heavy and do you want to check the result of a singular texture before doing a render? (Instead of visualizing THE WHOLE model with textures of course!).
BEFORE
AFTER
STEPS
1.
2.
3.
4.
and only that object will be renderized!
Disclaimer: this is a fast guide, a tutorial, an how-to article that I personally wrote for you. Feel free to write here any kind of suggestion! It is helpful if you need to solve your problem, if you need a tip or if you are in trouble and you need an help!