Negative energies are something that makes you tense, worried, stucked up.

Few things mentioned here are to help genuine people with simplest techniques. 

Hope it helps all.... !!!

Some remedies to protect against negative energies:

1.  Never leave your hair or nails in unknown places. 
2.  Do gayatri yag on Sundays. 
3. Keep your home clean and organized; burn some "googgal" - especially at the door (with cow dung cake and kapoor) 
4. If you have a triangular area, then it develops Vaastu
5. Ishaan corner should be kept clean and shouldn't have any tall trees either 
6. Fix any spots caused by leaking water and any breaks in the walls - keep fixing if they keep developing 
7. If you see tantra symptoms in your home, everyone should to the following mantra:  "om kham brahm" (with nasal sounds) - do it for 21 times out loud 
8. For 5 Tuesdays, burn candle (akhan jyot)from "mustard oil" or "jasmine oil" which should be non-stop burning for the 5 Tuesdays in front of Hanuman 
9. Plant at least 5 Tulsi/holy basil trees 
10. Take Ashoka tree leaves, throw them in your bath water at night and use this water to take a bath. 
11. If you wear silver in your small finger, then no one can play with your mental energies 
12. If you wear copper in the Sun finger, then too no one can play with the energy in your mind.
13. Ultimately if  you're happy, then that's the best.