Move the cursor over a link and use Ctrl+C to copy it to the clipboard (but if there is already a selection then Ctrl+C will copy the selection rather than the link.)
Alternatively, hold the shift key and then use middle mouse click on the link to copy it (this works regardless of whether or not there is a selection.)
To copy multiple links, hold the shift key and then use left mouse click on the link to add it to the links already copied to the clipboard.
Alternatively, select the links, then click on the click copy link toolbar icon <img src="icons/link48.png" style="width: 16px; height: 16px"> to copy them all into the clipboard.
Last but not least, turn on the Auto hover copy option so that when the cursor hover over a link longer the Auto hover delay then it will be copied automatically to the clipboard.

Advanced feature: the "Middle click close" actually has nothing to do with copying links, but it's there if you want to quick way to close a tab with just a single mouse click. This feature is off by default. Icons are taken from Ionicons.