I've got a domain setup with Google Domains. I'm using CloudFlare for the name servers and I have the correct MX records setup (https://support.google.com/domains/answer/9428703) to point back to Google Domains so that I can use their email forwarding feature (all email from the various addresses gets forwarded to various Gmail accounts). I'm now trying to figure out what SPF record I should create to prevent email spoofing. So far I haven't been able to find any concrete details on this. I also wouldn't mind figuring out if it's possible to create records related to DKIM and DMARC.
If you are using gsuite, your SPF record should be
v=spf1 include:_spf.google.com ~all perhaps that will work since it is google generic SPF by the look of it.