Try upgrading create-react-app or using npx (npx create-react-app). If that doesn't help try nuking your npm cache (npm cache clean).
The only relevant parts of the message you're seeing are the final two lines: npm has trouble finding @svgr/webpack in version 2.4.1 (which definitely exists). I would recommend checking the remainder of the output for any other mentions of that package.
The other lines you pasted are just warnings because create-react-app uses dependencies that have fallen out of date and optional dependencies that are not supported by your platform.
It also looks like you're using Windows. If you feel comfortable with Linux shells you might want to look into WSL. For beginners it can be a bit daunting but having spent a lot of time on Linux this was an eye-opener for me: daverupert.com/2018/04/developing-on-windows-with…