I tried using it last week and again this week but my location no longer seems to update.

As far as we know, recently Google has changed this feature (turned it off). So, it's very difficult now to use Google to change your location and see results as if you're in another location. Pretty much the only thing you can do now is use a proxy service or VPN to change your location.

Most of those links are going to be nofollow links, so when it comes to building Domain Authority, it's generally not going to be recognized as a link that passes DA. Google, on the other hand, may actually count those links--as we've seen nofollow links help rankings.

As you build links, keep in mind that it's good to drive real traffic (which helps rankings) and social media shares (which helps rankings) and build your natural link profile (which helps rankings). You need nofollow links for your link profile to be natural.

Any guest posting that you're doing and  how it affects your site's search engine rankings will depend on your site's link profile. If you're only doing guest posting and that's how you're getting your links, then that may put up a red flag and it might affect rankings. However, if you have thousands of links from other sites then a few guest posts aren't going to hurt, they should help.

Keep in mind, though, that any guest posts should comply with Google's webmaster guidelines, the blogger should disclose that it's a guest post, and typically it should be a nofollow link to your website. If it doesn't comply, it doesn't matter how many posts you have, even a few could get your site penalized.

When it comes to title tags, Google will truncate and even change certain title tags, and that depends on several factors. One of those factors is the actual search query used. When it comes to title tag length, keep in mind that there are two things that can influence whether or not it gets truncated or not: number of characters used and number of pixels used. If the title tag is over 65 characters or over 487 pixels it will get truncated.

Take a look at your title tags to see if this is the case. If it is, then you'll just need to use a shorter title tag.

Even though Yoast is saying the keyword does not appear in the url or any subheadings, the page still has a good chance to rank well. As long as you use it in the page copy, you should be fine. Concentrate on the internal links to that page (for example, use "moringa powder" in links that point to the page.

Also, you'll most likely need links from other sites to that page with that anchor text "moringa powder". It's also good to mix up those anchor text links from other sites, such as using "ultimet moringa powder" and "moringa ultimate original powder" so it's more "natural".

We generally recommend keeping all of that content on the website, there are only a few cases where you would want to remove the content (for example if there are copyright or legal issues involved). Your site, over time, will become larger, and this is a good thing.

Fashion trends tend to come back, so in 5 or 10 years if you still have that content on the site it may become relevant again. And, if it's been there for 10 years then there is a good chance that it will rank well--because it's been there 10 years and it's trusted.

Whenever you have products that are similar (but only different in color variations or size variations), you should use the canonical tag to specify this. Keep these URLs indexed, but generally speaking the canonical tag is there to help in these situations.

There are literally thousands (or hundreds of thousands?) of sites using the canonical tag successfully.

If you have changed the URLs with trailing slashes, then there are a few things you'll want to do:

• make sure all the internal links on your site are updated to point to the proper version.

• make sure that the sitemap.xml file(s) are correct, pointing to the proper version.

• set up 301 permanent redirects so that the ones with the slash are redirecting to the old URLs.

As long as you have corrected the links internally, updated the sitemap file, and set up the 301 redirects, everything should go "back to normal" within a fairly short period of time. You will need to give it time, though, as Google will need to re-crawl all of those URLs and get it all ironed out.

Generally speaking, this is normal, and you shouldn't have to worry about it. There's a Google Webmaster thread that pointed to this issue specifically, and Google gave an official response (https://www.seroundtable.com/google-sitemaps-duplicate-16128.html)

"This is apparently normal if you submit Sitemap files with the same URLs listed multiple times. Since submitting the same URLs multiple times doesn't change anything with regards to your site's crawling & indexing, I'd just submit it once if you want the correct counts (alternately, if the count doesn't bother you, you can also just leave it like this."

Dmitrii is correct, it really should have no effect on rankings. It might have an effect if you were to do it in the anchor text of links to the site, but generally speaking Google knows what the   is.