You can use prepared sources in your Figma from the Figma template gallery and you can also import your Sketch files or use the Sketch app sources.
If you would like to master your pen tool you can try The Bézier Game.
https://developer.apple.com/design/resources/
https://m2.material.io/resources
https://www.templatefreebies.com/
https://www.sketchappsources.com/
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