Links Question

Hi

Please help. I’m a newbie and am stuck.

How do I make a page which has clickable links that can take the reader to another page for a full explanation. E.g. On a main page: ‘Guide to Space’. Clicking ‘Mars’ will take them to Mars info, clicking ‘Jupiter’ etc etc.. maybe 25/30 links or so? Where do I make/keep this full page with all the info/lowdown? What’s the procedure for making it

Sorry, but I’m brand new to this and can’t find the answer anywhere.

Cheers