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no it is not a practice for them to

Red and Black are considered neutrals, but they are very bold and sophisticated-looking neutrals.

Tan or Caramel would work very well for a Traditional look; you could throw some green in there as well. Gold, Pewter, and Bronze would really come off as very sophisticated. For a very 'modern/contemporary' look, you'd go with white and gray. Of course, all of these have to be the right 'shade' to go with the shade of red you already have.

It really depends on what kind of 'look' you're after. You have to decide on a 'theme'. And, it's always easier to decide on paint colours from the fabrics you're using, namely your drapes or sofa or area rug.

Indeed, even if you don't have an area rug, (or don't want one), it's good to go window-shopping for one online just to see how the colours work together. You can get a wealth of colour-combination ideas from looking at area rugs. They come in all styles… Oriental, Modern, Asian, Country, Tapestry, etc etc.

This activity would probably help you decide on a 'theme' as well, if you don't already have one.

Here's a link to Home Depot's Area Rugs:

And to JCPenny's:

Here's JCPenny's drapery link to look at too:

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It is because oil and water don't mix.

You have to use a solvent for oil to clean the brushes. Turpentine or mineral spirits. Pour some into a lidded jar or can, rinse the brushes thoroughly in it, wipe the brushes, then clean with soap and water.

Put the lid on the turpentine jar, and keep to re-use (the paint solids will settle to the bottom; eventually, when there are too many solids, you'll pour off the clean mineral spirits into a new jar or can, and dispose of the old one.)