Here is some good information for caring for Christmas cactus.
There are 3 types Easter,Thanksgiving & Christmas. everyday care; Very bright light,water thoroughly only after completely drying,good drainage,leave in same pot for years they do better when root bound. here is additional info. https://www.joyusgarden.com/how-to-get-your-christmas-cactus-to-flower-again/
After once. Week that’s it put in the sun
Water once a week and it likes sun
They require very little maintenance. They like indirect light and water only when completely dry.