The God of Lust. Why do Kamdev mantras exist in the first place?

There are mantras that exist to kill people also. Kamdev is a very good thing to have. There is this famous story, he was burned by Shiva.

Does it also mean that Shiva can contain your lust completely? Yes, he can. Shani Dev can cause problems?

Yes. If Shani Dev is not well placed in your horoscope.

There are tantric pujas for Shani Dev. Yes. Can you meditate to a point where you become as powerful as the devta?

You will most likely die before that. Say Krishna comes and you say that you are 100% going to turn into Krishna in its full capacity and power. Your body simply doesn't have the capacity to take that power.

From a larger context, space in general, there's something up there that is supposed to teach us. The moon plays a vital role.

There is no one-thumb rule. In fact, Jupiter can be very negative. For example? A lot of things, diseases, blood sugar and hormonal problems, liver-related issues, financial issues can come from Jupiter.

First time ever hearing this.