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.

[[headers]]
  for = "/*"
  [headers.values]
    Referrer-Policy = "same-origin"
    Strict-Transport-Security = "max-age=15768000"
    X-Content-Type-Options = "nosniff"
    X-Frame-Options = "DENY"
    X-XSS-Protection = "1; mode=block"
[[redirects]]
  from = "https://example.netlify.app"
  to = "https://example.com/"
  status = 301
  force = true