@Anjana9638 A tool like Xenu, Site Sucker or Screaming Frog to name a few and then have the tool only focus on reporting external links to minimize crawl overhead.

@mitty27 Your iFrame at the top of the page is hard set to 1200px width which could cause problems. Please provide some specific URLs that GSC has identified with the viewport issue for specific answers to those. Thanks and good luck!

You can submit sitemaps as often as you like to Google Search Console. Many large scale sites would even be doing so multiple times a day as they publish new articles, add or remove new products, and so on. For example, News Sites have a high touch need for fast crawling (hence AMP and specialized sitemap methodologies) Here's Google's help article on this: https://support.google.com/news/publisher/answer/40392

Here's the more generalized version of Sitemap recommendations: https://support.google.com/webmasters/answer/75712

Great follow up!  Thanks for that. :^)

Hello. You can check the Submitted vs Indexed count within Search Console to see whether or not your regenerated sitemap is being picked up already, but resubmitting a sitemap isn't an issue, and fairly easy to do, per Google:

Resubmit your sitemap

1. Open the Sitemaps report
2. Select the sitemap(s) you want to resubmit from the table
3. Click the Resubmit sitemap button.

You can also resubmit a sitemap by sending an HTTP GET request to the following URL, specifying your own sitemap URL: http://google.com/ping?sitemap=http://www.example.com/my_sitemap.xml

Via: https://support.google.com/webmasters/answer/183669  Also from a FAQ in the Webmasters blog they state that, "Google does not penalize you for submitting a Sitemap."

Matthew makes great points. I'd add to this that having conversions tied to membership data makes it all the more person specific. This is why you'll here numbers like 74% conversion rate for Amazon Prime members (see: https://www.internetretailer.com/2015/06/25/amazon-prime-members-convert-74-time). Aside from better tracking you can begin to see the value for Amazon in having members...

1. Similar to Facebook they're collecting user data per person and building a massive user base aside from just sales.
2. Better tracking.
3. Higher conversion rates.
4. Top of mind branding.
5. Upselling
6. And so on...

You get the idea. That's why when you go to Amazon.com the only pop-up or animated prompt you'll see on the home page is to "sign-in".  Obviously, this could be something out of scope for your project currently, but food for thought down the road.

Here's my take.  Some footer bests aren't necessarily links.

**What is the good, bad and ugly of backlinks in the footer: **

1. Good: Links are like a mini sitemap. Footer is a very useful addition to the page above it. Features heavily used features of the site that benefit the page by being available in the footer as well.  NAP. Anti-Spam. If links are external, they're to parent or partner companies within the same overall company.
2. Bad: Spammy. Tries to link to every page on the site with keyword heavy text. Broken links. Obvious paid links to external sites.
3. **Ugly: **Low utility. Never updated. Service provider links.

Hi Rena. Yes, if both sites are separate domains that you want to use in different ways, then you should place a different robots.txt file in each domain root so that they're accessible at xyz.com/robots.txt and abc.com/robots.txt.  Cheers!

Hi James! This type of URL rewriting is a best practice when it comes to presenting visitors with easy to read page descriptions so whatever capacity you can apply it would be great. Here's Moz's guide to URLs which goes over your question as well as further details into URL structures: https://moz.com/learn/seo/url

Also note from that page:

In addition to the issues of brevity and clarity, it's also important to keep URLs limited to as few dynamic parameters as possible. A dynamic parameter is a part of the URL that provides data to a database so the proper records can be retrieved, i.e. n=3031001, v=glance, categoryid=145, etc.

Note that in both the Amazon and Canon URLs, the dynamic parameters number three or more. In an ideal site, there should never be more than two. Search engineer representatives have confirmed on numerous occasions that URLs with more than two dynamic parameters may not be spidered unless they are perceived as significantly important (i.e., have many, many other links pointing to them).

Cheers!