Cleaning the data is absolutely possible in Tableau, through Tableau Prep. Which is an ETL (Extract, Transform and Load) tool used for cleansing and shaping the data which allows various data scientists and analysts to perform data visualization.
Clean data helps in faster loading of insights. If you are aiming for a career in Tableau, then start off by reading the Tableau tutorial and if you are preparing for Tableau Desktop Qualified Associate certification exam and want to gain a better hands-on experience on Tableau, then check out the Tableau certification course from Intellipaat.
Watch our video on Tableau training which might help you get started.