Precure Watch Order

TV only release order (50 episodes each):

Futari wa precure (2004)
Futari wa precure Max Heart (direct sequel)
Splash Star
Yes precure 5
Yes precure 5 GoGo (direct sequel)
Fresh
Heartcatch (2010)
Suite
Smile
Dokidoki
Happiness Charge
Go Princess (2015)
Mahoutsukai/witchy
Kirakira
Hug tto
Star Twinkle
Healin good (2020)
Tropical rouge
Delicious party
Hirogaru sky

With the exceptions of Max Heart and GoGo, all the TV precure are standalone, so you can just start with whichever you want, but the All Star Movies feature the precure from previous TV seasons together, so knowing the release order comes in handy.

Below is the TV AND Movie release order