how high the trading fees is?

[Clausfx]

There are two possible answers to this question: simple and correct.
The simple answer is that you are limited only by the size of the minimum deposit with your broker (the company that provides you access to the market): without a broker, you will not be able to trade on the exchange. The size depends primarily on the particular broker and on the market in which you want to trade

[AbdulShiek]

Some charge rather steep fees for each trade, while others charge very little, depending on the level of service they provide. A discount brokerage firm might charge as little as $10 for a common stock trade or even less, while a full-service broker might easily

It is suspicious when an exchange site charges a little.

[Sendo12]

It is suspicious when an exchange site charges a little.

I agree with you. Trading is not supposed to be cheap but of course we are still looking for those exchange sites that still charge reasonable price.

[Newbie_trader]

Some charge rather steep fees for each trade, while others charge very little, depending on the level of service they provide. A discount brokerage firm might charge as little as $10 for a common stock trade or even less, while a full-service broker might easily

Most companies have reasonable system fees. Almost all commodities have increased since last year.

[Trader_Rob]

Trading fees depend from broker to broker. I suggest that you look for potential brokers and compare their trading costs.