Is it safe to invest in money market?

Money markets a simply bonds with short maturity, meaning (usually)government bonds that will expire in (usually) less than one year.
Not like regular bonds they are almost independently connected to the expected rate return of the period that the security will expire. In "regular" bonds there is also the risk factor (the "default" risk) where higher risk leads to higher yield but in money markets this is almost not a factor because these bonds are usually with very small risk (because of their short period to execution and because they are usually government bonds).
In money markets there are no "coupons". The price you pay is a beet less than 100 and the money you receive in the end of the period is 100. The difference is the return rate (in rough calculation)
The bottom line: YES, IT IS VERY SAFE

Try Mutual Fund, it is safe and profitable.

it is safer to invest in forex rather than Commodities frank ly speaking

There is no such a market which is safe. All invole risk and it is a matter of how much. And your returns correspond to the risk you can take (or bare).
I guess no matter is it the money market or security, you need to get to know the thing you want to invest on.
Together with other factors such as how much capital you have, for how long you want to invest, how much risk you can take, the rate of returns you want, etc... to determine if you want to invest in this market.