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Is there a way in QGIS to prioritize the layering order overlapping polygons. I have a shapefile with numbers in the attribute table from 1-20. Each number is associated with its own polygon. I want to layer the polygons from highest number to lowest. I would like to colour fill them as well. And it's basically a contour map.

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There is an option to activate the Control feature rendering order under Symbology:

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in which you can identify the rendering order based on a field:

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However, since overlapping polygons are considered topologically incorrect, it is better to clean the contour polygon to get rid of overlappings. The solution is to use v.clean tool from Processing toolbox -> GRASS GIS 7 commands -> Vector -> v.clean, and in cleaning tool use Break. Please have a look at Cutting all polygons with each other - mega slicing answer which solve this issue with illustrations.

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    Thank you for a tip about "mega slicing"
    – Taras
    Commented May 16, 2019 at 4:52
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    @Taras You are welcome :)
    – ahmadhanb
    Commented May 16, 2019 at 4:53

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