@tlfong01 I bought it at a local store, I don't have much information about it except its 24V, 10Watt per meter and 3000K

@tlfong01 I dont see the wiring diagram in that video, could you check the link?

@tlfong01 the gate-source threshold voltage is too high for a 3.3V logic level. Vgs,th should not be more than half the logic voltage at most, especially if you switch high currents. So my judgement is: the mosfet is not suitable and it will become hot and may fail.

@SimSon what kind of mosfet do you suggest to use?

As I said, I suggest to use a MOSFET with a Vgs,th of no more than half the logic level voltage at max.

@SimSon good news. I replaced the MOSFET with IRLB8721 and it's working. BUT the power of the LED lights is very weak... why is that? reminder - it is 24V LED strip with 10watt per meter

Can you messure the voltage between drain and source? In case the mosfet is fully on it should be in the range of millivolts.

@SimSon when led turned off its 8.2V and when turned on (full bright) its 4.72V

I see, the IRLB8721 appears to be unsuitable, too. Its Vgs,th is 2.35V, but you need a mosfet with no more than 1.5V. Ideally, you want to measure 24V when the mosfet is off and 0V when it is on.

@SimSon what other features I should look up for when searching for the right mosfet? other than Vgs,th <= 1.5V. Any recommendations on how to search for it?

Well, voltage and current ratings are trivial. Next priority is Vgs,th to be as low as possible. When switching currents of more than 1A, the last thing is an on-resistance Rds,on as low as possible, as this will determine the final voltage drop (U=RI) and power dissipation (P=RI²) in the mosfet. But the most critical feature when controlling mosfets with a Pi really is Vgs,th. Search for "Logic Level MOSFETS".

@SimSon I tried looking for one here digikey.com/en/products/filter/discrete-semiconductor-produc‌​ts/… but none have all features you recommended. I will really appreciate if you could help me find one or two which fits

I see, it's not as easy to find one with Vgs,th below 1.5V as I thought. Maybe you choose one with Vgs,th<=2V. Power dissipation might be higher then, so a low Rds,on is a bit more important. IDK how much current you expect, but a MOSFET I'm often working with is the DMG3402 (Vgs,th<1.4V), but it's an SMD mosfet. I guess you'd prefer a through-hole version...

... DMT6009LJ3 should work

or IRLU024NPBF