It's obvious that understanding thyself can make our life easy. And not only that knowing what we are good at can make it easy to choose things for life. It helps us to decide how we want our life to flow, what to reject, and move forward without any struggle.
I'm not sure how many of us can say that they know their strength very well. Maybe a handful of people. Because we have a tendency to go with the flow rather giving time to explore and discover our own strength. Not only choosing the right profession but also in every aspect of life, it can help.
You will see a lot of disappointed, unhappy faces around you. And one of the major reasons behind this is they are not satisfied with what they are doing. There's no need to tell that we these happen because we don't analyze and prioritize our strength. It's not like we always can be sure what we are best at. Because it's hard to find our 'strength'. But we can have a basic idea of our power.
Moreover, understanding what we are good at helps us to decide what not to choose. I think that's more necessary than anything else. Because we can always choose what we want to choose but rejecting many of them is a tough thing to do. You can save yourself from wasting time in this way. Also, learning our skills, personality, etc can be done by learning our strength.
There are several 'strength tests' available, free to the paid method to help us do this. I think if you are unsure about your strength and what to be successful by improving your skill it can be a good choice.