I need to validate my site propely, please i need help.

When I tried to validate this was the errors that I received:
Notes and Potential Issues

The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation, or other things affecting the output below. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.

1. Using experimental feature: HTML5 Conformance Checker.
   The validator checked your document with an experimental feature: HTML5 Conformance Checker. This feature has been made available for your convenience, but be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies. If you find any issues with this feature, please report them. Thank you.

1. Line 135, Column 63: The background attribute on the body element is obsolete. Use CSS instead.
2. " class="home page page-id-50 page-template-default">
3. ✉
4. Line 221, Column 168: The frameborder attribute on the iframe element is obsolete. Use CSS instead.
   …utube.com/embed/IAqy7gX06OU" frameborder="0" allowfullscreen></iframe></div>
   ✉
5. Line 238, Column 24: Element center not allowed as child of element h1 in this context. (Suppressing further errors from this subtree.)
   <center>
   ✉
6. Line 238, Column 24: The center element is obsolete. Use CSS instead.
   <center>
   ✉
7. Line 246, Column 180: An img element must have an alt attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
   …www.perezbusinesscenter.com/wp-content/themes/colorwaytheme/images/1.jpg"/></a>
   ✉
8. Line 250, Column 221: An img element must have an alt attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
   …ter.com/wp-content/themes/colorwaytheme/images/2.jpg"/></a>
   ✉
9. Line 256, Column 213: An img element must have an alt attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
   …www.perezbusinesscenter.com/wp-content/themes/colorwaytheme/images/3.jpg"/></a>
   ✉
10. Line 262, Column 226: An img element must have an alt attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
    …www.perezbusinesscenter.com/wp-content/themes/colorwaytheme/images/4.jpg"/></a>
11. I need to fix this thank you.

 

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