Significator is event giver. Suppose for a Simha lagna native, Jupiter is in Revathy star in Meena. Mercury is in 9th bhava.
Jupiter is the lord of 5th and 8th bhavas. Jupiter is in the 8th bhava in the star of Mercury. Mercury is lord of 2nd and 11th.
In Jupiter period the native enjoys 9th bhava resuls as well as 2nd and 11th bhavas results. He gains through long distance travels, communications, father etc through his ownership houses 5th and 8th houses (as Jupiter is transiting in Mercury star) but not losses.
Here Jupiter gives 9th, 2nd, 11th, 5th and 8th (if no other planet is in the sign or star of Jupiter). Jupiter is said the significator of 9,2,11,5 and 8.
Rahu and Ketu are nodes they have special features. They will give the results of the planets conjoined with them, aspects of the planets etc.
These are some fundamentals to be taken care of. There are so many factors to take into consideration in offering predictions.
If you are interested please purchase the standard texts and read. Think and apply logically.
Thank you for giving me this opportunity to share with you my views.
Good Luck
JVS Rao