Give him/her the opportunity to use the potty when he/she wakes up in the morning, from naps, and before bed.
Your baby will also have their own cues that you will learn over time.
For my first baby, it was grunting.
My second baby wasn’t so obvious, but a lot of the time he farts before he needs to go (TMI sorry!).
Take off his/her pants and diaper.
Sit baby on the potty or if they are younger/smaller, hold them in a seated position on the potty.
Say “go potty” and we would sign it as well (optional but i’m a HUGE fan of baby sign language).
After the deed is done, get excited, praise him/her, and sign potty again. This reinforces that they did what you wanted them to do.
If it doesn’t seem like they are interested in going, take him/her off the potty before they get too fussy. You want to avoid having negative emotions associated with the potty.