Linked text should tell a visitor what they will find on that page
W3C offers this advice about how to use link text in their Web Content Accessibility Guidelines:
Good link text should not be overly general; don't use "click here."
Not only is this phrase device-dependent (it implies a pointing
device) it says nothing about what is to be found if the link if
followed. Instead of "click here", link text should indicate the
nature of the link target, as in "more information about sea lions" or
"text-only version of this page".
Linked text should tell a visitor what they will find on that page, without them having to read the surrounding text. This allows the page to be skimmed more easily, and improves accessibility for those using screen readers, which work by reading the selected text when a user tabs between links.
If you use "click here" multiple times on a page, not only will you make linked text much harder to skim, but you'll create a usability nightmare for those using screen readers. When they tab between you'll links, they'll hear, “click here!“ for all of them, without understanding where those links will send them. (If you have to do this, use the title attribute on link text to explain what you're linking to.)
Improving your examples
Instead of the examples you gave:
- You can find more information about certain topic over here.
- For more information about our trip, click here.
You could write:
Or simply:
Make it clear that the text you're highlighting describes what will be found on the linked page.
Possible exceptions
The only possible–if somewhat dubious–exception to this is for sales pages and marketing, when using active, commanding link text such as "click here" may increase conversion:
The goal was to find out if the wording used in hyperlinks could make a difference in click through rates. The answer is yes. They found that the right two or three “click” link words can lift click through rates by more than 8%.
– From Does Telling Someone to “Click Here” Work? on Copyblogger.