Questions and Answers - H1 tags, Iframe, Content, Title

1. How is Google handling multiple h1 tags in HTML5?

Google does not treat HTML5 differently & having multiple H1 tags on a page is fine. Be reasonable when using them, use them where they make sense. There's definitely no penalty for using H1s. 

2. Title Tags and H1 Tags should be different?

I think its good practice to let title tag and main headline look similar for two reasons:

1. Usability - if title and headline are more or less the same, it's easier for users to identify the page they clicked through to from the result pages as the one they found on the search engine because search engine results use the title as main result element, whereas the element immediately visible on the page is the headline, the title there is invisible as long as users don't know exactly where to look for it. It may, therefore, irritate users if title and headline differ too much.

2. Keyword prominence - it's obvious that it makes sense to use the same keywords in titles and headlines, simply because a single page should always define it's topic as exactly as possible, which means there will always be only two or three main keywords any given page will be optimized for.

I mostly advise my clients to 'coordinate' title and main headline, i.e. make them more or less similar - and use secondary headlines to emphasize synonyms, co-occurrences, longtail phrases or additional keywords.

3. Should we maintain Different H1 Tags on paginated pages?

In pagination, you don't really need to bother much with it.

Because it's a machine and it can't make reasonable assumptions and decisions.

4. Partially duplicate copy on a page - Duplicate Content?

If the amount that comes from an external source is small compared to what you have on the page there's no problem. Using or not blockquote makes no difference actually.

Obviously, your site will not rank for that content. Should not. It should rank for the original content.

You can, of course, use the duplicate content in an iframe, and the source page of that iframe can be noindexed. Depending on the platform you use to build your site it may be easy or hard to accomplish.

Ref. - https://googleblog.blogspot.in/2011/02/finding-more-high-quality-sites-in.html

Google’s update is designed to reduce rankings for low-quality sites—sites which are low-value add for users, copy content from other websites or sites that are just not very useful. At the same time, it will provide better rankings for high-quality sites-sites with original content and information such as research, in-depth reports, thoughtful analysis and so on.

5. Bottom text link and menu navigation - Duplicate content?

No, normally it should not. There are some sites however that stuff a "navigation" element into the footer with links to every single, possible page on the site with lots of keyword rich anchor text. That can be considered spammy keyword stuffing and when it exceeds normal, unique content of the page, it may become problematic.

Google perfectly understands the structure of a website:

• ·         Header (repeated)
• ·         Main content (unique for each page)
• ·         Sidebar (repeated)
• ·         Footer (repeated)

In fact, in HTML5, there are even special tags to distinguish between these (plus navigation tags) so that bots can understand the structure better.

6. Does Google crawl iframe content?

It crawls the page that your code is framing. It won't attribute that content/value to the page that is just using an iframe though. 

If I use this so what is impacts on website SEO

None. It won't help you at all to frame someone else's content. I hope you have other significant unique value to add on your site.