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Take a look at crystalac clear filler. It does not need coloring since it drys clear and what you see is the wood color.

For wood that I’m going to paint, I like to use Bondo, drys hard & fast, does not shrink. Nail holes & cracks can be sanded & painted within 15 minutes. Knot holes & build up for sculpting will take a little longer.

For anything I’m going to paint, I use paintable latex caulking, Alex brand. About $1.50 a tube, works great for gaps too like crown mouldings on uneven surfaces.

Another cool trick thanks Thorreain

Of course the best filler is the same species wood with matching grain ,other alternatives are epoxy with some matching color mixed in ,great for loose knots after you remove any bark that might be present.You can many times add an inlay over a defect or damage to hide it,making it into a design element. I’ve even been able to use iron on banding a time or two.