Question

write the net ionic equation of the reaction of FeCl2 with NaOH

Answer 1

Just separate them based on their ionic charge. Ion means they contain a charge, whether it be +/-.
For instance, if you separate NaOH into ions, you get: Na\(^+\) and OH\(^-\).

In your given problem, you have: \(\sf \color{red}{FeCl_2 + NaOH \rightarrow Fe(OH)_2 + NaCl}\)
Now, you can separate them into ions like I did above for NaOH.