Having a different description meta tag for each page helps both users and Google, especially in searches where users may bring up multiple pages on your domain (for example, searches using the site: operator). If your site has thousands or even millions of pages, hand-crafting description meta tags probably isn't feasible. In this case, you could automatically generate description meta tags based on each page's content.
Link text is the visible text inside a link. This text tells users and Google something about the page you're linking to. Links on your page may be internal—pointing to other pages on your site—or external—leading to content on other sites. In either of these cases, the better your anchor text is, the easier it is for users to navigate and for Google to understand what the page you're linking to is about.
Being a good internet Samaritan is great and all, but how does this help you build links? Let me explain: the kind of broken links you’re looking for are found on sites relevant to your business, industry, or niche. By finding these sites and informing them of these broken links, you strike up a conversation with the site owner and give yourself the opportunity to suggest a link to your epic piece of content be added to their site. How to Get More Organic Traffic (FAST)