When you buy some cryptocurrency, the money will be withdrawn from your bank account or card and you will be credited in your exchange in a sum matching the cryptocurrency you have purchased. Each exchange may allow you to trade for one or more cryptocurrencies. Each cryptocurrency on the exchange will have its own wallet. You can store your cryptocurrency on an exchange but it’s not a recommended practice. I will cover this in a section called Wallets.

Dollar-cost average: This sounds complicated, but it’s not. Dollar-cost averaging means investing a set amount of money at regular intervals, such as once per week or month. That set amount buys more shares when the stock price goes down and fewer shares when it rises, but overall, it evens out the average price you pay. Some online brokerage firms let investors set up an automated investing schedule.
Define and write down the conditions under which you'll enter a position. "Buy during uptrend" isn't specific enough. Something like this is much more specific and also testable: "Buy when price breaks above the upper trendline of a triangle pattern, where the triangle was preceded by an uptrend (at least one higher swing high and higher swing low before the triangle formed) on the two-minute chart in the first two hours of the trading day."
Investor Protection: Along with wealthy and institutional investors, a very large number of small investors are also served by the stock market for their small amount of investments. These investors may have limited financial knowledge, and may not be fully aware of the pitfalls of investing in stocks and other listed instruments. The stock exchange must implement necessary measures to offer the necessary protection to such investors to shield them from financial loss and ensure customer trust.
Warning: Only invest in cryptocurrency what you can afford to lose! Be prepared to lose everything. Expect high fluctuations. Do not put in there money that is vital for you whether it is paying for rent, utilities, loans, mortgages or necessary goods (food & medicines). See this as spending money on collaterals or nice to have: restaurant, books, travelling, cinema etc.
Should the company management and majority owners choose, they can pay one or more dividends per year to stockholders. The money for these dividends will typically come from profits earned within the business. In most countries, these dividends are subject to income tax payable by the receiver. Often there is a withholding tax taken at source to ensure that non-resident shareholders pay as well. 
The stock exchange shoulders the responsibility of ensuring price transparency, liquidity, price discovery and fair dealings in such trading activities. As almost all major stock markets across the globe now operate electronically, the exchange maintains trading systems that efficiently manage the buy and sell orders from various market participants. They perform the price matching function to facilitate trade execution at a price fair to both buyers and sellers.

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When thinking about the mindset of investors, The Great Crash 1929 by J.K.Galbraith (reviewed here) should also be required reading. Typically, any sustained fall in prices - known as a bear market - is very destructive to wealth. However, as Galbraith explains wonderfully, each bear market is unique and is a reflection of the bull market that came before it. The book explains a great deal about the feedback loops that can exist when prices rise and fall as more people are either sucked into or forced out of holdings. It is the reference work about a very important slice of Wall Street history.
You may decide to invest ad-hoc or on a regular schedule basis. You may for example want to invest 40% of your allotted funds into mainstream, “secure” investments such as Bitcoin, Ethereum or Zcash. You may decide to spread out the remaining 60% to cryptocurrencies listed in the top 20 or top 30 projects based on capitalization on coinmarketcap, if you feel this is a secure strategy.

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