Alternatively, I signed up with Changelly. But they ask you to enter your ETH address. I have an Electrum address, can I use my Electrum address or no?
Avoid Changelly because often, what you get is much less than that appears on the site (there are always hidden fees)
The price of Bitcoin may rise so I suggest that you transfer using Coinbase it is true that they ask for high fees, but the fluctuation of 3% is normal in Bitcoin and profits may be made due to the fact that the price of Bitcoin is now cheap and may increase in the coming days.
When you gain enough experience, you can try alternatives.
R. Okay thanks, Hugeblack