Google Search Console Error Messages

Hello,
I have been getting notifications from Google Search Console that I have issues with my blog posts.
Several of my posts have the following error messages:

Error Tag found outside the document head which is only allowed as a direct child of the document head.

Error Malformed URL found for attribute ‘href’ in tag ‘a’.

Error Disallowed attribute or attribute value present in HTML tag.

Error The author stylesheet specified in tag ‘style amp-custom’ is too long – the limit is 75000 bytes.

The script tag contains invalid JSON that cannot be parsed.

I read through the forum for this topic, but i have not idea how to go about fixing these.

Any help would be very much appreciated!
Thanks!
May

The page I need help with: [log in to see the link]