Bhavat Bhavam can be explained with 2 concepts:
The first concept is more important. In this concept, we count exact number of houses from any house to analyze its situation. For example, If we want to know about 4th house then we can see 4th from 4th house i.e. 7th house. Like, to analyze the condition of 2nd house, we need to look at 3rd house as it is 2nd from 2nd house. Another example: The 7th house is house of our spouse and marriage. Hence we also need to look at 1st house (7th from 7th house) in order to see the kind of partner we would attract, then we also need to consider our 1st house qualities i.e. our looks, physic, general intelligence, common sense etc.
The second concept is: in order to judge the condition of any house we consider that house as 1st house and then look at other house from it. For example: As 4th house is our home i.e. the place we stay and relax, our furniture, vehicles. Hence it is resting place for our physical body.
Similarly 11th house is house of our earning. So 4th from 11th house is the place where we store our assets and money i.e. bank accounts, safe etc. Second house is the wealth and assets we store and also what we receive from our family, and 11th house is money earned through our own efforts.