i got a thrixanthocereus cactus a couple days ago but i dont know how to take care of it properly, the lady told me to water it with 1/2cup of lukewarm water and thats it. i googled how many times to water it and it says when the soil is completely dry. i dont wanna kill my first cactus LMAO.she also told me to use like a bowl for the excess water, i also have no idea what the things on the back of the card mean please help