How to deal with control variables?

[Maha Natsheh]

Hello all,

I have the share price for plenty companies, and other independent variables including 2 control variables which are 1- The size of the firm which = log(assets) and 2- the leverage which equals total liabilities and total assets,
how can I deal with both control variables? should I include them in my principal regression or not?
please note that my data are Panel data,

Thanks in Advance !

[Carlo Lazzaro]

Maha:
the most trivial advice is to follow the tribal rules in force in your research field.
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