I only have a weekday Siddur. Is the Amidah the same on Shabbos?

In my build up to davening 3x a day, my rabbi has told me to say the shema twice and the Amidah 3x a day, and once I have that down for a time, to add to it.

I only have the weekday Siddur, is there any difference to what to say on Shabbat?

Thank you