Hard Wood Floor

I want to reseal my oak hard wood floor. I like the color and don't want to do a lot of sanding. Just want to reseal them and fill small cracks between the boards. The house was built in 65.
What would be the best to use?
Thanks

There is no right way to do this without first taking off (sanding) the existing floor finish.

A new coat of finish will not cover up scratches or dings and dents. But, if you clean it up by removing any dirt and wax (silicon dusting sprays are nearly impossible to get off and WILL affect the finish), it may look okay. TO get a new look, you need to refinish. In the 60's, it's unlikely that they used one of the high-tech silicon carbide enriched super tough finishes.