Thank you, bob123! While I was researching which wallet to download and install, I had read about people who had downloaded a "fake" Electrum and getting stuck with malware, so I made certain that I downloaded from https://electrum.org/#download. I also used the DigiCert tool to check the signature.
And thank you for explaining to me that people do not try to "deposit" satoshis into a wallet in the traditional way that someone would deposit money into a bank account.
And thank you Abdussamad for telling me that I must also whitelist Port 50002! If you hadn't pointed that out, I would have whitelisted only the "attacking" computer and URL, and I would have been back on this forum asking for help figuring out why Norton was still blocking the "attacking" computer/URL.
After years of contemplating bitcoin, yesterday was the first time I ever set up a wallet. I remember about 10 years ago that I was hearing about this new decentralized and anonymous way to "bank" and manage "money". I was going to purchase $100 worth of bitcoin just for the heck of it, but I couldn't really devote enough time to figure out how to do it. And I kick myself now for not MAKING enough time to figure out how to purchase or earn bitcoin because I would have had just over $9 million! My "timing" on many things has always been "off", so I wouldn't be surprised if the exchange value of bitcoin tanked the day after I actually made a purchase! Oh well, that's life!