Electricity is a very broad topic. For this post, i shall be focusing more on static electricity, where a charge is built up and transferred to another body through a very short time. This is often called "transient current".
The static charge can be produced by rubbing two objects together. In any static electricity occurrence, it is always the electrons that move and not the positive charges. Thus when we say a positive charge is produced on an object, we ar actual saying that the electrons moved out of the object, thus giving it an overall positive charge.
There is also a very important concept called "earthing". Earthing of an object can neutralise the charge on it. For example, if we earth a positively charged object, the electrons from the ground would come up to the object's positive charges and neutralise them.
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