Is it generally credible to submit your resume on the recruitment website and be told to go for an interview?

The credibility of formal recruitment websites is generally high, but it depends on what kind of work it is, such as recruitment group performance. Most of them are unreliable, and many of them are leather bag companies that cheat money. If you are worried, check online, but now many companies are recruiting online, so you don't have to worry about regular jobs or anything. Come on! Wish you success!