Without any technical knowledge, these people invest their money in the market and later lose all the money.
If you buy some shares of the company, then you get that much share i.e. ownership in that company.
To start investing in the stock market, first you have to open your demat account with a broker.
Some investors do not trust online brokers, those people should understand that all brokers are under the control of SEBI.
Zerodha in India is now No. 1 broker and this company has been the preferred broker company of all traders since 2010.