I don't want trial and error to find best screen resolution 'cause World of Warship has too many choices. I screen shot YouTube then "Display" window from my Windows 10 laptop.
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It is the best to use the resolution recommended by Windows (in your case 1024x768), as it knows your monitor capability. If you use other resolutions image may get stretched and that affects game performance. Aspect ratio can be calculated using sites like this, if not set by game automatically (your ratio for recommended resolution is 4:3).
Edit: as pointed up that game does not support the recommended resolution you should use the highest resolution with same aspect ratio your monitor supports.