We use the Past simple when something happens in the past and the action has finished.
We form the 'past simple' by taking the verb and adding -ed.
Past Simple = verb + ed
For example:
I walked to school.
Her cat jumped on the bed.
My sister baked a pancake. ---> 'to bake' already ends with 'e'. So we just add 'd'! Same with 'raked' and 'moved'.
I steadied myself. ----> 'to steady' ends with a 'Y', we change that into -ied instead of -ed or -yed. Same with 'studied' and 'married'.