Rahu - the things you need to achieve in the present life.
Ketu - the things you need not achieve in this present life .
Rahu - your goal in this present life
Ketu - your goal in past life
Rahu - tough to achieve but very much obsessed to get
Ketu - already experienced so less obsessed
Rahu - Future
Ketu - Past
Rahu - all kind of materialistic desires
Ketu - non materialistic desires
Rahu - very greedy , do anything for fame .
Ketu - don't care anything for fame
Rahu - head without body , actually it's shadow of saturn.
Ketu - headless body , actually it's shadow of mars .
Rahu - very excited to achieve but very tough to get
Ketu - already achieved in past , so becomes your comfort zone .
Rahu - becomes most important house where he is placed
Ketu - becomes less important to the house where he is placed except ketu is in either karmic sign or rahu's naksatra.
Rahu - never gets satisfied , so he wants more, more & more
Ketu - dissatisfaction