I have actually mentioned it in the next sentence without giving further explanation. I will include that in my next tutorial.
Yes, but I wasn't talking about importing a "private key" tho... I'm saying that you import can create an entire SegWit wallet using the BIP39 seed. For the most part, it will function exactly like a "Standard" Electrum SegWit wallet... you'll just be missing the ability to view your seed.Quote
However, it is possible to import a nested SegWit address private key if you created your wallet on a website which supports this type of address
@pooya87 Thanks for your suggestions. I will edit my tutorial once I have some spare time. I will try to finish a tutorial on more advanced features of Electrum by the end of this week. Do you have any idea which more advanced features of Electrum might be difficult to use for some people?
I think you should mention 2FA wallets... and how they work... and how much they charge for service fees! 
A LOT of new Electrum users setup 2FA wallets and don't read the disclaimer correctly... they miss the bit about the charges, and then scream scam when they get charged 0.001 in their first transaction for 20 credits. At least mentioned in the description you have that extra service fees (charged by TrustedCoin) apply... Link here: https://api.trustedcoin.com/#/electrum-help
Other advanced features to consider explaining:
- Dynamic Fees
- Replace-By-Fee
- BTC vs. mBTC unit display (Electrum defaults to mBTC I think)
- maybe consider describing how to do an offline/online (watching-only) wallet setup?
- MultiSig wallet setup
- If you have access to one, describing how to use Hardware Wallets with Electrum