I like to start this thread by saying there are many different techniques of grounding the one I am posting here is the simplest for those starting out in meditation or for keeping them self in the here and now.
This was taught to me years ago before I moved into the practice Hermetics, and Magick
The fist thing to do is either standing or sitting comfortable and getting relaxed but focused imagine that there are roots extending from the base of the spine down through the legs through the bottoms of the feet with each exhalation like the roots of a tree going deeper and deeper into the earth.
Feel you legs and your body becoming heavier as the roots connect to the Earth Mother Earth
This probably he easiest technique to learn as one progresses the techniques for grounding will become more advanced as you find and move towards the path that you choose as you choose certain techniques will be taught and more experiences will be gained.