got a message that my Macbook got a virus ... how to handle this?

how to make sure that it's fake message? when I follow the message it send me to the AppStore ask me to install something like Mac-Cleanxxx and it will scan My MacBook then said that I have some issue and direct me to Mc Afee to download cleaner

How can a popup on your screen magically analysis your computer to inform you have a virus.

Mac-Cleanxxx

Mc Afee to download cleaner

Both of these are not needed, it is a scam and they are trying to up-sell you.

These apps do more harm than good on the Mac, you will be worse off.

If it tells you to use a cleaner, you can be sure it's fake. Also avoid MacKeeper.

The only trusted anti-virus is Malwarebytes:

https://www.malwarebytes.com/

got a message that my Macbook got a virus ... how to handle this?

Avoid phishing emails, fake 'virus' alerts, phony ... - Apple Support

Ok, understand Leroy ... thanks a lot.

Btw, how about MacKeeper? is it a good software to maintain files in MacB, delete and clean unused file?

MacKeeper is one of the worst, with one of the best marketing strategies—

unsolicited popups are commonly used to deceive people into installing software they should never intentionally install.