How does the stock market work? How to invest in it? What are to consider for the probability of earning?

At what cost would be the minimum investment?

stock market is just a trading platform for buying and selling companys' equity. interested traders and investors will buy or sell the stocks if the stock price is at their targetted level. you can start invest in stock once you have your own stock trading account. but the most important questions would be,

how to know which stock to invest in?
when you should buy them?
and, how you can make money from?

Look, fundamentally, you can use various key financial ratios to start screening which stock worth your hard earned money. from there, you can go to the next level by further study how they perform qualitatively. Look here for more info:

How to Pick A Good Stock
http://www.stock-investment-made-easy.co...
Guide in Analyzing Stock
http://www.stock-investment-made-easy.co...

then, you must study how much the stock worth. to do this stock valuation, you have to calculate intrinsic value. once you got it, buy the stock when it is at its margin of safety, either it was discounted than its intrinsic value, or discounted from the past historical prices. Look here for details:

How to Calculate Intrinsic Value
http://www.stock-investment-made-easy.co...
How to Determine Margin of Safety
http://www.stock-investment-made-easy.co...

now the last question, how you can make money from it? look, good company will grow over time. if you invest for your retirement, you can sell the stock after 20 years with as much as 30% return per year! doesn't it sounds good? and besides, you'll be earning dividends year after year, which will also grow annually!

Penny Stocks, Make More Money in Stock
http://www.stock-investment-made-easy.co...

do not invest monies that yoy connot afford to loose

The stock markets work on the principles of supply and demand. It is basically a large auction where ownership in a business is being auctioned.

You invest in the stock market through a broker who you pay a small commission to in order to purchase shares of stock.

There is no 100% way to guarantee earnings. It truly just take a lot of knowledge and practice to figure out a strategy that works best for you.

Some brokers require no minimums to open a brokerage account; however, you truly need at least $2,500 dollars, in my opinion, to make investing in stocks worth the effort.

My only advice is Get educated.

Any investment without education is very risky. Learn and try is in small amount and learn from your mistakes.

My take for Stocks is that I never like stock investing, because they are risky.

I prefer in using options for my investment.