Have your website installed Google Analytics?
If yes, you should see all traffic statistics there.
Also, there are some tools out there as alexa and similarweb which allow you to see traffic of any website but it is not really exact.
Most probably Google Analytics is most recommended. Its free and fast.
If you have installed GA, then you must check its dashboard menu options Real Time, Audience, Acquisition, Beheviour and Conversions.
Google Analytics is one of the best tools to check traffic on your website. You will be aware of the number of visitors you are getting in your site, time spent on the website, and content that gets more traffic.
And you can use SEMrush, Alexa to find your competitor websites traffic.
If you're using a wordpress theme, than Monster Insights will tell all of your website visitors world wide. You can use tracking tools, or create your own link. Ex. affiliate link & source=
If you want to get to know your website traffic. Google Analytics is the best tool or if you want to know your competitors then ahrefs, semrush and etc tools are good