I'm a Buddhist from a Theravada background who also found great resonance and connection with Zen Buddhism. Meditation is a deep topic and I still consider myself a noob. I only recognize how ahead the curve I am when I look back into my past and into other people's lives.

If I have to give one killer tip, that would be Anapanasati. Here is a book which I haven't read (I learnt meditation over 15 years gradually): http://www.buddhanet.net/pdf_file/anapanasati.pdf

Anapanasati is known as the meditation that all Buddhas practice to achieve their Buddhahood. The meditation in the simplest sense is the awareness of inhaling and exhaling taken to the ultimate extreme. Remember me telling you that I'm a noob? That's because if you think; you are not doing this meditation right. It's pure awareness settled on a single act that keeps your body alive. And most importantly that's all there is to Anapanasati. Getting to that point is all that books of teachings is about.

As you can imagine, the ultimate pure focus and awareness should result in the perception at its highest level; Thus resulting in enlightenment. The sharper your mind becomes, the better you comprehend which leads to better decisions and better actions resulting in better consequences.

Short. Simple. Effective. And I'm still a noob. But at least it's only a matter of execution and seeing it to the end :-)