SEO

As the matter of fact, yes.

1) Tags create content on your page - more content with keywords - better for SEO

2) Tags are additional keywords - you may use up to seven in metadata, but as many, as you wish, in tags

3) Better Drilling of your site - your visitors will check for cloud keyword=aka tag in order to find all available information on the subject

Well, your site needs a constant growth in all indexes, such as Alexa, Google, Compete, etc. If the analytical tool you are using shows you constant improvements and increases in:

a) # of visitors
b) # of returning vs. # of new visitors
c) Time spent on site per visitor
d) Number of pages per visitor
e) Low Bounced Back Rate
f) More visitors come from Organic Search, rather paid search, referrals, or direct traffic
g) More visitors made a transaction (e.g., registration/download/purchase/contact)
h)Interest indicated for advertising/partnership with your site
i) more keywords become easy for you to use for organic search results, and your placement become better on a certain number of keywords from one month to another.
j) more one-way relatively close back links created to your site

(order doesn't matter - just what was on top of my head

Then, you are good.

If the indexes and/or your tool shows growth, than, you are doing fine and you may look then on how to speed up the process of growth (an SEO guru might help you with that

What would you get after search engine optimization except the optimization itself? SEO as a Search Engine Optimization becomes a well-known term,
especially in circles related to Internet/Web technologies and between
website owners. But do you really know that what you get optimising
your site? Read more

Keyword analyzes are very important. Which keyword is more searchable? Which just sounds great but nobody really uses it? You need to have some idea of what keywords are worth to be worked on, and what can be passed to competitors, if they want to be first in the row on them. 

Keywords is an important part of SEO. Many say, it's on a backstage now, but this is not correct. It still plays a significant role in overall organic on-site optimization. So, don't be fooled, work smart on your keywords. There are always tools to check at least some of the importance of your keywords -through HubSpot, Compete, and other sites that allow free SEO trials or free SEO tools