A special thing I can do/that I am good at

I have no idea what special thing I can do but I can do simple math quickly and a lot of people have trouble with multiplying simple numbers together.  I could build a computer if I tried to or I do great at building legos.  I am almost always on the computer so I can do stuff for people in case they have problems.  It is nice to be able to help people or be able to fix things because those skills are the most important ones in my opinion.