Is there something wrong with using CNAME with root domain?
When I use CNAME with root domain it give me error like tihis:
CNAME Flattening will be applied to this record since root (i.e. apex) CNAME records are limited by the DNS specification.
Yes, you cant create a CNAME for it. Cloudflare works around that by flattening it into an A record.
For url forwarding I must add CNAME with root domain. Is this cause any problem. For example email delivery or something else? I am use cloud server.
Usually: yes it could lead into problems. But Cloudflare wouldn’t be Cloudflare if… nah… Read this 
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