I have visited an onion link of Brave's official site, will this compromise or harm me or my digital life in any sense in any sense?

Ans: No, but you might read the following reference material. There is a suggestion in the 2nd link (by “Rethanis, Community Ninja”), that in some circumstances, it may be better to use the Tor browser, than to use the built-in Tor Onion Service of Brave Browser.