Hello there, في and بـ both are ok. There is no rule when to use it,personally when I speak I use the one comes to my mind first and sometimes when use one and need to repeat the sentence once again we use the other ,for example: انا كنت عايش في كندا ..شو ماسمعت ! وين كنت عايش ؟ بقلك كنت عايش بكندا

If you want to say" in" in the spoken language use ب .You use" في" in the spoken language if you want to say "is there" or "there is". ?في مشكله- is there a problem في شي بالعلبه- is there something in the box مثلا، بالفصحى انا في البيت---correct انا في بيروت---correct أؤمن بالله--correct معترف به--correct ولكن بالحكي انا بالبيت--correct انا ببيروت؟--correct بأمن بي الله- أتصل فيك-correct معترف فيه --correct I don't know if there is a rule,but yes in general bi is used in the spoken language instead of fi.

للتحث وبالعاميه لا يفرق ب او في

Okay They are more small details Actually it depends on using the language But using ب more time is main feature of al sham countries speaking

well it's an easy and non easy question.. both can mean (in) or (with) it depends on how do you use it, you can give examples and i would tell you when to use ب or في , and sometimes you can use both :)