Selenium is a very popular automation testing tool for testing web-based applications through a web browser and is not meant for desktop software and mobile applications. A Software tester with Selenium as his skill set could make around $92,000 in the US according to famous job portals. And when added with other factors like work experience, job location, company he/she working for, additional skillsets (varies with the company), etc. the salary for the selenium tester could go well over $120,000.
If you wish to start out your career to gain Selenium as your skillset, then check out the Selenium certification course from Intellipaat, which offers you a very good course designed by industry experts with many years of experience. Also, watch the YouTube video on How to Become Selenium Developer in 2021? And get started.