Don't dispose of Bitcoin Core for the wrong reasons. Being "huge" makes it not depend on third parties, which is one of the unique features of Bitcoin.
I use both Bitcoin Core and Electrum, they both have some benefits.
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I understand. I just happen to have one of those computers that only has 30 gigs of memory on it to begin with. I just purchased an SD card with 128 gigs just because of bitcoin core, but it will work out handy because I've run out of room for windows updates.

With Electrum, I clicked send, entered the address which started with 3EN. And then I clicked Send. However, it remains unconfirmed. I read something about having to Broadcast it? How would I do that?

I just saved it and it said "Note: this is an offline transaction, to send you need to broadcast it"