Conductive thread can be used like ordinary thread. If you can sew a running stitch you can easily use this thread. The main difference between ordinary thread and conductive thread is it electrically conducts, this allows electronics to be integrated into your textile projects.
Conductive thread has metal incorporated into it (usually silver, nickel, tin or copper) with a core of normally cotton or polyester. As it is a thread it also allows you to sew by hand or machine and even embroider designs into textiles.
There are many different uses of conductive thread it is used in one example of one of its uses is a fencing jacket. The jacket is made with conductive material scoring areas which can become extremely worn with time. The jackets are expensive and fencers usually try to get them repaired by darning the worn areas. Conductive thread can be used for this quite successfully when it is sewn into the fabric of a jacket where the conductivity of the material has been lost over time.
A great introduction to wearables is adding conductive thread to your gloves ready for the winter. You will then make them smart gloves.