Are the crypto groups that on telegram reliable?
Please care to mention some groups that you follow and have a good success rate.

We've seen currencies going haywire in the past. Bitcoin diamond (BCD) always pops up whenever there is a drastic change in the value of the currency. $19 one day and almost reaching $100 the next day.
Is it safe to invest in it now?
Or should i wait for it to drop more?

Over the years we've seen how bitcoin has become the pioneer, god of cryptocurrency. This community is the result that bitcoin is working fine and after 9 years it has still maintained it's integrity and we as a community will not let it die.
I want to know has Bitcoin ever been hacked? Has it ever had any issues with security? And no i'm not talking about the exchanges being hacked. I'm talking about the blockchain network it offers.

To all the people who are still mourning/whining the crash of the market(even though it has stabilized and it's increasing now) and are looking to get back in the game, here's a good news for you all. Binance coin(BNB) is all set for the third burn and you should start stacking up your BNBs.
Here's the article - https://www.cryptorecorder.com/2018/02/18/the-upcoming-march-burn-will-push-binance-coin-bnb-to-50/

Are there any coins which are deleted as the time passes so as to decrease the supply and increase its value?

Also i would like to know about coins which have less circulation supply than btc and are less in value.

It's been almost 5 hours and I cannot login to my  Binance account and the app is not letting me trade. I tried talking to the customer support and it's not responding.
This is something which was not expected from Binance.

Are there any coins which give guaranteed returns i.e. give interests after they're deposited for a specific time?

It's been more than 20 days since tron gave a lot of people a bump on the head by being on the lower side. Finally there may be some good news for the people who've been holding on to this.
The founder of Tron tweeted that it's listed on https://www.huobi.pro/

https://medium.com/@Tronfoundation/trx-was-listed-on-famous-cryptocurrency-exchange-huobi-pro-d50ff6350def

Vechain(VEN) has recently given me very good profit(almost double). How good is it for long term?

Are there any wallets that don't require kyc but can still allow us to trade.
Wallets for both altcoins and bitcoin.
And what are the advantages and disadvantages of such wallets?

This is for all the people who've been blindly buying coins because the world is doing it.
By 'process' I mean what all topics you research, before you finally get the confidence to buy that particular currency.
The complete thought process is really appreciated.

This question is for all the people who fell prey to those assholes in the market.
Kindly share your experience and help the people around. Maybe they follow a pattern.
When did you first realize that the ICO you invested in is a scam? What's the behaviour of the various scammed sites?

Can anyone explain me in simple english what is bitcoin correction? And why does it happen?

As the new year passed, we saw the dominant cryptocurrency exchanges and wallets like zebpay, buyucoin, koinex being incompetent in dealing with registering new users and also halting the withdrawl/deposit feature. Which exchange would you recommend in this year?