It is one of the safe wallet but not 100% because electrum faced vulnerability on it couple of time as far as I remember and many lost their funds due to it.
Users lost funds because they downloaded fake Electrum wallets from phishing sites. They downloaded and used them without verifying the signatures. Multiple mistakes had to be made for the funds to be stolen.
@OP
You will be OK as long as you follow the advice given to you by Pamoldar and if you have common sense not to use the computer where you have Electrum installed for anything unsafe.