Im a noob here but these are my suggestion:

1. How can I extract the text of repetitive elements on a webpage using web commands ? Easy Option

• Use the command Web Browser Commands \ Element Action to get the value from the element.
• Use the web element recorder button to record interaction with the elements.

Advanced Option

• Use JS Inject command to execute js on the page. Use the queryselector js function to get the element. (a tutorial)
• SelectorsHub chrome extension to find the elements

2. How do I navigate to a specific link on a page, navigate back to the same page and then navigate to another page for specific number of times ?

• use variables to store the links for navigating back and/or for other pages.
• navigating to specific link on the webpage can be done using the web recorder. there are 3 functions under Web Browser Commands - Navigate to URL, Navigate Back, Navigate Forward