China continues to build a firewall to combat cryptocurrency
On February 5, 2018, China's central bank took another step toward building a firewall to prevent domestic traders and investors from accessing international cryptocurrency trading sites.

 I think the Etherbanking- this new project is not much information to confirm it is fraud.  it will need more time to check. However, almost 99% of investment projects entrusted (HYIP) will eventually be Scam. In my opinion Ether banking is a hybrid platform similar to BitConnect. But now many people who invest in trust projects like this because its profits are very attractive. 

Here are some of the websites that I often research and study about the newest ICO projects before investment:
1.https://tokenmarket.net
2.https://www.smithandcrown.com/
3.https://www.icoalert.com/
4.https://www.ico-list.com/
5.https://www.coinschedule.com/

i think Bitcoin payments are not accepted by government in China also as many other asian countries, because bitcoin has not shown its true value. The bitcoin value is based on the number of users. Its value is not stable, can be increased or drop down rapidly. Moreover, besides Bitcoin, there are many other coins in the world's crypto currency, which makes bitcoin lose its value when currency market is fluctuated..
Laws in Asian countries  is not complete as developed countries. Their technology and laws are not enough to manage virtual currency transactions. There is a risk of money laundering or delinquent transactions

i think they ban it to buy some time to figure out how to tax it. This would be my interpretation and hope.

Will bitcoin continue to fall to $ 6,000$-5,000$?
Yesterday bitcoin has fallen below  10,000$. Today bitcoin continues to fall deep down to 8,200$ and possibly more.
I bought bitcoin at 15,000$. Who can advise me to keep or sell bitcoin at this time? Will bitcoin continue to fall to 6,000$-5,000$? what should I do? please..

since 2018, the release behavior, supply and use of means of payment not legally (including the virtual currency Bitcoin and other similar) can be fined from 50,000,000 to 300,000. VND or imprisonment from 6 months to 3 years according to the provisions at Point h, Clause 1, Article 206 of the Penal Code 2015 (amended and supplemented in 2017). 

 
 After the announcement of the closure of the trading floor and lending service, most investors sold off BCC, which led to the BCC down more than 80% of the price. Now many investors still can not withdraw BCC out of trading platform for sale because of not working system. For this unstable system, I think I should not invest in this time.

Ripple is not a ambiguous as other currencies. It only focus on international payments, use blockchain block supply for banks with oversea transactions.
Ripple allows banks to save up to 30% of the cost, but for users, this number up to 50-60% for money transfer or payment operations.
Ripple does not have any barriers, payments can be made across borders. Transactions are freedom, directly and immediately with very cheap fees.

Besides studying the basic knowledge about cryptocurrency, coins wallet, blockchain  technology,ICO... you must be research and review the white paper, roadmap , chart and market fluctuations ,... after that following the comments from good traders on which ICO is  potential or not , that is good views for you guys.

On January 24, Weiss raitings has judged Bitcoin is worse than ethereum. Because bitcoin faces old system troubles, causing delays  and high transaction costs. we should continue to invest in bitcoin in 2018?

Bitcoin is the most typical of crypto currency, first published, and widely used in e-commerce with small transaction costs and not through intermediary organizations. Bitcoin is like real money but can not be used in offline market such as cash but can only be used online based on internet transactions.

Because I am beginner , I am limited about information. Can you help advice some good website or prestigious community to discuss about bitcoin, white-paper, technology, platforms,...

As I known, ICO is a kind of risky investment. Similar to the IPO which is the form of invite for capital investment, but when buying IPO, investors can research the information about the company they invested, find out about official finance reports and be protected by law when joining. In contrast, ICO projects are often rather ambiguous and unprotected by government so the risk is so high for investors.
So how to evaluate a potential ICO project, look forward to receiving comments from you