With Netlify it's quite easy to quickly spin up a new website with a lot of good default out the box, but there's a few options that are good to set for both security and seo reasons.
Firstly it's good practice to have some headers set to improve security. For example setting X-Content-Type-Options to nosniff will disable sniffing of mime types. Setting X-Frame-Options to DENY will prevent the website being rendered in a frame on another site and Referrer-Policy of same-origin will reduce the amount of referrer information sent to other websites.
It's also a good idea to setup a redirect on the Netlify subdomain that Netlify will have created for your site. If you don't, then you could find the wrong URL ending up in Google.
1[[headers]]2 for = "/*"3 [headers.values]4 Referrer-Policy = "same-origin"5 Strict-Transport-Security = "max-age=15768000"6 X-Content-Type-Options = "nosniff"7 X-Frame-Options = "DENY"8 X-XSS-Protection = "1; mode=block"9[[redirects]]10 from = "https://example.netlify.app"11 to = "https://example.com/"12 status = 30113 force = true