When choosing a broker, do not act spontaneously, study everything very carefully in order not to be mistaken.
You should study the entire history of the work of a particular broker. The duration of his work in this field of activity is of great importance, so I chose Expertoption and I am satisfied.
When a broker has a lot of functions for trading and inviting just for the client, then he really inspires confidence.
What kind of broker are you looking for? If your a scalper looking for a suitable broker, I suggest my broker FP Markets because of lower slippage and when trading with EURUSD, the spreads start lower at 0 pips for most parts of the day.
You can choose a broker based on what type of trade you will be doing, or you can choose a broker that provides a variety of conditions, and you can choose the most suitable options for yourself.
It seems to me that the fastest and most reliable way to find out information about a broker is just to go to him and try to trade.
I suggest trading with a couple of brokers like CMC and FP Markets. These two brokers offer some of the lowest spreads with good trading conditions. Especially FP Markets because I use EURUSD, which is highly volatile, and FP markets spreads are even stable during high volatile market movements.