Links are the ones which lead to the required content. And links play a major role for the implementation of Search Engine Optimization for your websites. Links are placed in every websites these links like a gateway for the other websites or pages. Normally, every website has pages which have different content in them and the links for all these pages will be posted in the home page.
A good e-commerce template must give provision for jumping to other pages easily by providing quick links in every page. And incase you maintain more than one site then you can mutually help one and other for increasing the flow in the each other websites.
This is done by placing the links of one another sites in the pages of each others websites. But incase use intent to advertise your website in another site then you can come into an agreement with other website manager for mutual help. And if you want to check whether the other person is being loyal to you or not, then it would be better if you use any link verifier tool.
This is will help you in verifying whether all your links are placed in the website or not and accordingly you can plan your strategy. For the betterment of your site it would be better you find reliable link partners so, that everyone can profit from the agreement. You can find high quality partners by just making a simple market survey.