What is the best SEO tactics for the subpages of the site?

Its all always better to use relevant KW's in sub-pages/internal pages.

If your website is providing mobile shopping service means, its better to use the KW's like "mobile shopping London", "mobile accessories UK' - like this you can use.

I have use ling tail KW's here, you can use any in your own ideas. But make sure that those KW's are relevant to your home-page/service.

Search Engine optimization is the most important part of website to prosper in online business. SEO is simply the use of search engines to generate traffic to a web site. It is the process one adopts for a web page to be indexed by search engines. Our real purpose is to rank your site high in search engines.

Follow the Below Steps:

* Onpage optimization

* Update Title, Description and Keywords should be different for each page.

* Directory Submissions

* Link Exchange

* Article Submissions

* Social bookmarking submissions

* Press release submissions

These are all the ways to get good position in search engines

Submit to site directories
Submit with your site’s name using your keywords, and then you could be ranked more highly on Google for those keywords, which means more traffic.

Joining Communities
Joining forums is a great way to promote your service and to network. If you become an active member in forums you can use your reputation to promote your website. Many forums receive large amounts of traffic and people pay attention to well respected members with high post counts.

Submit your blog to search engines
Most people get the majority of their traffic from search engines. When people search for your keyword and find your site or blog, there’s more traffic.

Writing articles
Writing articles is a great, free way to promote your online business, and can bring in a substantial number of targeted customers to your site, usually within a few days. The key is to submit your article to as many databases and directories as possible.

Each site page should have different meta keywords, well of course depending on the topic.

Also build links for the inner pages (along with home page)...it will help

Using variants of your main targeted keywords on your inner pages would be OK. You would only target one smaller volume keyword for one inner page.

Thanks,