When you are handling crypto it's always recommended that you deal with extra care. It's really frustrating to see people are losing their coins because they did something wrong and their coins are long gone.
When you are dealing with a desktop wallet like Electrum, there are few things you need to ensure:
1. Download from the official site. :
https://electrum.org/#download2. Before installing please
please please make sure that you have verified the signature to ensure the authenticity even if you download it from the official site. Tutorial:
https://bitcoinelectrum.com/how-to-verify-your-electrum-download/3. Now you are good to install and use.
To ensure extra security this is what I do,
Instead of keeping my coins in a simple standard wallet, I create a 2/2 multi sign wallet and each key I keep in two separate computer. When I send a transaction then I access both computer to sign the transaction. I understand it's extra hassle but it ensure my coins not to be steal by accident.
By the way, you might miss to read this as well:
Electrum vulnerability allows arbitrary messages, phishingSorry for you loss bud. I hope you have not lost much.