Cool. Now let's see some concrete stuff that might help.
One of the common mistakes when people start SEO is to crowd to many keywords on one page. Think about what Google Bot sees when he reads the main page. It asks:
What is this page about? It's a bit about many things - car locksmith, Safe car locksmithing, Fast Locksmith, it works in alexandria,virginia,washington DC,Arlington,VA. This is along with the current text on the homepage as seen by Google Bot right now:
24/7 Locksmith Service - Keyless entry | locked out | lost car keys
<cite>fastlocksmithdc.com/</cite>
Locksmith Service provides professional keyless entry, locked out and lost car keys services with complete customer satisfaction.
A bit to many things, you will get small credit for all keywords, and will probably rank for many keyword combinations on very low positon as a result.
Now, what do you think Google will rank first when an user searches for "safe locksmith services in Alexandria"?
A page with the following title, description and focused content:
Safe Locksmith Service in Alexandria - Open 24/7
www.asd.com
We provide 24–hour locksmith service across Alexandria. We get there fast and we solve the problem in a safe and professional manner.
or your page with not so much focus on this particular problem?
So, the idea is to get a big subject/purpose for each page. Then write a compelling title, good description, and content about that subject. Then, find the second big subject/purpose, write a title, description and content, and so on... Put it on the second most important page of the website. For example:
Homepage
Safe Locksmith Service - Open 24/7. The main keyword for this page are "safe locksmith service". You can add a few secondary keywords like fast, secure and so on, but without changing the big picture (you don). You can also add more location, not necessarily one. Just write them in the description or in the content of the page.
2nd page -> Locked out of your car (focus on this) - you already got this part
3rd page -> Locked out of your house (focus on this)
This are just some examples, not necessarily the best, you should choose which are the best.
Remember that enumeration means dilution, and your focus is lost. Right now you have 4 things on your homepage: "Locksmith Service - Keyless entry | locked out | lost car keys".
So, what's the most important keyword for your homepage? Then we'll think about a few variations (maybe with fast, secure, or locations). Then we will create an amazing title for that page, then a very good description, and content! Then we'll move to next. And just after that we will worry about linking and other stuff.