@htam9876,
1. I don't understand what you mean by "aspect".
2. A single charge has zero
potential electric energy since there is nothing that will put a
force on it.
3.
Energy involves the ability to do
work where work is defined as the ability to prove a
force over a
distance. I am using the underlines to denote that these are physics terms with very strict mathematical definitions (not to be confused with non-scientific versions of these terms).
If you take an Electricity and Magnetism course, you will do a lot of mathematical problems involving all types of
energy and
work. The law of
conservation of energy always applies, you get out the amount of
energy equal to do the amount of
work you do to the system.