Links, Text in links including ALTs, ALT image attributes, Comments

Links
Anchor tags on the page can also have keyword-rich text as anchor names. This text can be important to some search engines and therefore also for the rankings of the destination pages. Create anchored links with keywords in them to link pages of your website.

Text in links including ALTs
Images like buttons, banners, etc. may include Alt attributes as a text comment describing the graphic image. If this image has been used as a hyperlink, the Alt attribute is interpreted as a link text by some search engines, and the destination page will have a significant boost in rankings for the keyword in the Alt attribute. Use graphic links with keyword-rich Alts to link pages of your website.

ALT image attributes
Optimization of Alt image attributes gives you another opportunity to use keywords. It is advantageous if the page is designed with large graphics and very little text. Include the target keyword in at least the first three Alt attributes.

Comments
This tag lets webmasters write notes about the page code, which is only for their guidance and is invisible to the browser. Most search engines do not read the content of this tag, so Comments optimization will not be as helpful as Title optimization. The Comment tags should be populated with keywords only if the design of the Web page does not allow more efficient and search engine-friendly methods.