But this is valid for a CDN which manages all your traffic, there is also the possibility of using CDNs for part of your data, such as for emojis, fonts, coding languages, etc...
No, no, in order to use a CDN (never used one before), I'm assuming I must change my name servers from ns1.website.com to the name server of the CDN, no matter if its Cloudflare or another CDN provider?