Yes, this can be confusing when you're first starting out.

A keyword is a word or a phrase that your target audience would use when they perform a query in a search engine for a product or service, etc. For example, if the target audience for a particular landing page is a professional plumber, the copy on your landing page might really focus in on "40" linear shower drain" because a plumber might know to search for that right off the bat.  However, if the target audience for a landing page is a DIY'er who is researching how to build a shower pan for the first time, their initial searches may revolve around simply "shower drain". While both "40" linear shower drain" and "shower drain" may be considered potential keywords for your overall web marketing plan, you might only focus on one of those for any particular piece of web content,  while the other would not be considered a keyword for that page.

The reason different web pages might be crafted to target these individual terms is that the more specific a page can be in tailoring content to a certain keyword, the better able it is to compete with strong competitors who are also targeting that key phrase. If your page uses terminology that broadly applies to both audiences, Google is less likely to rank your page higher than a competitor page that focuses granularly on only one of them when that's what the searcher queries.

Simple, huh!

I know, not really. : )

Vikasnwu,

Yes, those kinds of issues are typical for the super-simple website design tools.   Do you want multiple h1 tags? No, you don't.  Will it hurt you in this case, no, it  won't. In the future, when you move to a new platform, you can take care of issues like that, but for now, I wouldn't worry about it.

Moz's index updates daily but that doesn't necessarily mean your DA or PA is going to change if and when the link is added to the index.  You should keep that it's not all about how often the index updates. The quality of a link plays a major part in whether or not it shows  in the index as well as whether or not it improves a site's rankings.

Link building is about keeping your nose to the grindstone, being creative, consistent, and recognizing where relationships with other websites will bring mutual benefit. Just focusing on  those things leaves little time to give much thought about one's domain authority score.

Do understand that a lot more goes into determining search results than just indexation of the words on a web page.  Certainly, G uses those words to understand what search terms the site is relevant for but other factors are in play too--like authority, as in your site's authority and that of your competitors.

Among other things, authority takes into account the site's age, backlinks and engagement history and those are factors on which a new site can't easily out-compete older, more established sites--even if the older sites are not dialed into exactly the same search terms.

Alan,

I have feeling that if you have to ask that question and your thinking starts off in the under $500 range, you may have a hard time understanding or recognizing why the actual cost for what you're looking for is going to be so much higher--and what you will actually be getting for your money. In any case, you should be prepared to sign a year agreement that binds you to pay a  total yearly sum and that stipulates exactly what your contractor is going to achieve for you.  Absent that, one or both parties is very likely back out early because of misunderstandings of what is being provided and/or what is required.

Linkbuilding is by no means a causal engagement--the future of your company/website is at stake. Just as you would educate yourself for any major investment by your company, you should be very, very well educated on the topic of linkbuilding before investing your company's money in it.

Conversal, it would be helpful if you could provide a couple of search terms that you think the site should be showing up in the search results for but isn't.