I need suggest about seo reports

[MoneyTools2017]

Hello guys

how are you ?

These are my blog reports:

Http://www.seositecheckup.com/seo-audit/www.casasgto.com

Http://validator.w3.org/check?uri=http%3A%2F%2Fwww.casasgto.com%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

Http://try.powermapper.com/demo/Report/b1564a4e-7393-41f2-b04d-a7f3cd72be62

Http://www.nibbler.silktide.com/en_US/reports/www.casasgto.com


Are these errors dangerous on SEO and my blog ?

Thank you