How to sell BCH into BTC I have an Electrum wallet since Nov 2016 with some BTC.

It seems that I automatically own BCH now (is this right?). What is the simplest way to sell this BCH into BTC?

Should I install a BCH wallet software (Electron?), and initialize it with the same Seed as electrum (isn't this dangerous?)?

Or is there another simpler system to sell my BCH into BTC?
Since you're using a local wallet, read these instructions on obtaining your BCH. For safety, you can transfer all your bitcoins to a new wallet first, then no longer use the old wallet for Bitcoin transactions. Also, installing BCH wallet software on a separate machine is a good idea as otherwise the Electron Cash wallet may sweep the machine for Bitcoin wallets and put your new wallet at risk.

There may be simpler methods, but at this point in time I'd expect they would increase your level of risk substantially.

To sell your BCH for BTC, you'll need to find an exchange you trust that handles both.

If you're interested, there was a fork into "Bitcoin Gold" too, on 24th Oct 2017, though it hasn't gone live just yet.