No. Even those cowards are necessary for any business, by buying they increase the level of the cryptocurrency but what makes the price drop are called big whales, they are the ones to blame. Now when the price drops, those cowards start selling which sucks 

This manipulation history will never end apparently! It is related to tether then it is related to the old whales story! Bitcoin price is still underestimated, why they cannot assimilate that?

It depends from the regulation in your country. Personally I do not trade so much but in case I made some huge profit then I will declare what I traded from cryptocurrencies to fiat since it is a fixed and precise price.

Ok it is true that ethereum is a great coin and its plateform is used by too many token projects buy that doesn't mean you need to invest all your money there
Best solution is to share your money between the major cryptocurrencies like Bitcoin, litecoin, ethereum... and try to invest also in new altcoins or tokens that have a great potential so you can double your investment.

No Bitcoin Gold price will recover if Bitcoin starts rising again like any other coin or if many people or big companies will join it in the future which is a little bit hard 
Bitcoin cash also lost significantly >75% from more than $3,000 to $740

Bumping the topic for educational purpose.

The road to moon needs a good missile with a decent engine, falcon heavy maybe which requires more consolidation before launching it 
People need to have confidence in the market again just like what happened in late 2017.

I don't know if we should call Bitcoin Gold a shitcoin or not. It started as a Bitcoin fork and it acquired a significant part of the cryptocurrency market before its price crashed hard.

Indeed Bitcoin is the best option but since the OP asked for altcoins then it is ethereum, litecoin and Bitcoin cash in my opinion. Dash and monero may rise also if Bitcoin start rising and all those coins can have the double price that it actually has.

I mean some tokens for example turn to be pure scam. Facebook do not really care whether token alpha is a scam or token beta is not. They are afraid of sanctions and followed Google and twitter decisions to avoid being criticised, that's all, then they wait for the first opportunity to allow it again gradually. They start by exchanges but some exchanges may scam users using the hack trick, then they will accept established services and so on.

Chickens, chickens everywhere! 
Ok, what we called big whales do not care about the price in the long term. They do daily trade and sell massively after the price rise to certain point then buy in deep so they can make a quick profit.
The smaller investor are scared when the price drop so they simply panic selling or panic buying too. Blind chickens! 

Facebook do not care about cryptocurrencies or care if it is legit or not, all it cares about is to avoid sanctions and to grab more money. They might limit posts offering free advertisements to an exchange but why limiting a considerable payment coming from paid ads?

No i do not think that this will happens, $6000 is already low for bitcoin and it is underestimated
this sad period should come to an end soon as people will start buying more hopefully 

The worst scenario will be the situation nowadays, not too much users. For blockchain, it will be implemented everywhere, for cryptocurrencies, i expect to be a surge in its usage but I think that many countries will launch its own local cryptocurrency for a cashless society.

Bad news, more people panic selling, less users buying, more players trading, pump and dump, keep buying and holding, we are the next wealthy gentlemen.

There is no relation between the two cryptocurrencies apart from having Bitcoin as a name or a part from the name and that BTG is a fork of BTC.
BTG as far as I remember is created to be asic resistant which is one of the important features it has, otherwise, it is not that important.

BTCC had a big loss after the action taken by the People's Bank of China and it tries now to escape from the country's law by switching to Hong-Kong by being purchased by another company there.

Inside hack is the first possibility that any policeman will look on it. Mt gox, is the best known example, at least until Karpeles proved to be innocent.

No, it will not end soon, like bank robbery, you can lower it as much as possible but you will find always some people trying to figure a way to steal from it.
Exchanges need to enhance its security level and customers need to move always their earning to cold wallets

Being legal in many countries is a good step so more people get involved in cryptocurrencies in general but that doesn't mean necessarily that the Bitcoin price will pass $20,000. The end of the year is always promising and having a stable price over $10,000 or $15,000 should be more important.