These are misconceptions of the purohits and amateur astrologers. Effect of the dasa depends on the charts of individual persons. Ex.Jupiter in one’s chart may signify certain houses that may be good or bad. The same Jupiter may signify in another’s chart. Then how the Jupiter in 1st person’s chart effect the 2nd persons chart. Please think the logic behind it.
If you give the dates, times and places of birth, we will check up.
Keeping left is good on the roads. If you walk according to the principle in the left, if any vehicle comes, can you keep left or take diversion. For every principle to apply there should be practical applicability.