In order to be able to trade shares on a stock exchange, you first need a securities account. A securities account can be opened at a bank or an online broker. The shares are then managed and held in the securities account.
That depends on the respective share. You can see the price of a share on various websites or with various tools such as TradingView.
Most beginners buy stocks of well-known brands, ETFs and stocks following a value approach.
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