Is online investment Jobs are reall or scam?

Answer 1

Some may be real, some are scams.

How do you know which is which?

If you're being promised lots of money for easy work with no actual skills required, it's probably at least intentionally misleading and you will not wind up making anywhere near as much as is promised, if it's not an outright scam that will result in you LOSING money.

If the "online investment" job involves cashing checks for and then wiring (a portion of) the money to someone else, then it's almost certainly a scam and you WILL lose money. The checks will be just good enough ... and drawn on a bank that's distant enough ... that your bank will release the funds to you in accordance with their policy before the check actually clears the bank it's drawn on; when it inevitably bounces, your bank will then issue a chargeback against your account, and if you've already wired most of that money to someone else, it will just be gone.

If you need actual qualifications ... like a college degree and a background in statistical analysis or something ... and the compensation seems to be in line with other jobs for people with those same qualifications, then it's more likely to be legit.