In online environments, ad servers look at a user’s IP address to figure out their ‎location.  Behind the scenes, the ad server maintains a large database that has ‎every IP address already mapped to its country, state, and postal code.  So, when a ‎request comes in, the ad server strips the IP address from the header of the ‎request, queries this table, finds the necessary location data, and then picks an ad ‎that matches that criteria.  ‎
Reason: If visitors find your website with a certain keyword but you have a high bounce rate, that’s enough to know that something is not going as it should. Ask yourself and test if it is a problem with content quality, appearance, etc. There is often more than one explanation for a high bounce rate, and there could be more than one solution. If you are totally lost at this point, a feedback session with five potential users might provide some insightful ideas.
Although more and more keywords are getting encrypted by Google every day, another smart way to come up with keyword ideas is to figure out which keywords your website is already getting found for. To do this, you'll need website analytics software like Google Analytics or HubSpot's Sources tool. Drill down into your website's traffic sources, and sift through you organic search traffic bucket to identify the keywords people are using to arrive at your site.
Using negative keywords in PPC campaigns is an often overlooked but highly effective strategy. These are keywords that you add to your campaign that you don’t want to target. Adding negative keywords will let Google know that it should not show your campaigns in searches that include these words. This is a crucial step in order to make sure that you don’t waste money by displaying your ad for irrelevant searches.

By sharing this information, you can align all stakeholders that are involved with any kind of messaging (i.e., print, TV, PR, SEO, PPC, email, blog posts, etc.) and get everyone consistently using your targeted keywords. As your audience observes messages from each of these channels, they will see that consistency. This can highly influence which keywords they then use when they use a search engine to find you or your products. These are, of course, keywords you already rank well for, which will help to increase visibility and branding even more for your entire organization.
So, fellow marketers, the secret is out—now you know that the key to really driving your conversion rate isn’t in minor copy or bidding adjustments. The true PPC CRO best practices require you to use negative keywords and to target keywords that your bottom-of-the-funnel prospects are searching for—including those that are pricing and service-oriented. You want to use high-converting ad formats, such as Google Shopping Campaigns and video ads, to capture the attention of your audience and engage them. Your landing pages should be designed well, easily browsable, and have fast loading times. It’s also important to personalize your ads so that your potential customers feel like you’re speaking directly to them, which also helps humanize your brand. Finally, use retargeting to remarket your products and services to previously interested visitors to your website, enticing them back and convert. 
We at SEMrush continuously monitor Google’s updates, as the search engine rarely stands still. While testing the updates that are most likely to impact advertisers, we have come to the conclusion that Google is moving in the direction of “autopiloted” campaigns. The message is clear, the more you delegate to Google Ads’ artificial mind - bids, placements, banner sizes, etc. - the more benefit you and your customers will get from the campaign.
Ad scheduling is important for optimizing your ad strategy. You can show your ad whenever a customer searches online or you can show your ad on certain days, or during business hours when you’re there to handle customer inquiries. Your ads give different performance result on different days of the week and different hours of a day. Therefore, have a look at which online days and hours are most suitable for your business and then schedule your ad during these times to increase your exposure. You can also adjust your bid for less performing hours and days.

GREAT suggestions, Nicholas! I've definitely customized this checklist for clients' various needs too (some care about having an "email signup form" as something to check, while others are international and we'd need to make sure their href lang tags were correct). Please keep the recs coming–this checklist will only get better as we make it work for different scenarios :)

The errors in technical SEO are often not obvious, and therefore one of the most popular. Mistakes in robots.txt and 404 pages, pagination and canonical URLs, hreflang tags and 301 redirects, http vs https and www vs non www versions: each of them can seriously spoil all efforts to promote the site. One quality SEO website analysis is enough to solve all the main problems in this part forever.
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