Knowing your own strengths and weaknesses can really help in both work and private live, especially if you also know the personality type of the other people your dealing with. Certain personalities can clash if they don’t recognize and respect each others perspective. On the other hand, having different types of people in a group can create the balance that is needed for a project to be successful. Knowing your personality type can also help you explain your work preferences to your current or future employer or team members.
I have done a MBTI assessment and the result was that I am a ISTJ type. Since MBTI is an internationaly recognized methology, there are lots of websites with information. They can tell you your strengths, weakness, work place preferences, your role in relations, personal growth strategies, career options, etc. The site https://www.personalitypage.com/ gives a good amount of information, which was very accurate for my situation.
There are no official online tests available, as they need to be taken under supervision of an MBTI-certified official, but there are a few unofficial test available, like this one: Jung Typology Test.