Let us presume that you have heard of Inkscape. It is a vector graphics tool which is free and open source.
And interestingly, version 1.0 just landed after 3 years of development with many improvements
Smoother performance, HiDPI support and a native macOS app, that is the punch line for Inkscape 1.0
Translations are available in around 20 languages, there is GTK +3 support, works with Windows, Linux and Mac, in-built Fillet and Chamfer, PDF export, Python 3 support, searchable symbols, customisable interface, dark theme and so on
Check out this introduction video
Ready to try it out or an upgrade ? Here you go