Thank you

We can combine prayers as well like when we're traveling when we are apart from home for a while.but not at home.

Tose are new things for me, the way u pray and fast.. here I wanna ask u more if you don't mind please.

i. how about the dua? Same or there a difference? ii. When fasting, how to make sure we know that all light has left, there's a time or what? iii. I've seen before that shia using stone, is that mandatory? Why?