Ah great, more things to spend my brain on.
According to the list of items in my starter kit... it's just a MOSFET. No details.
Online, its says MOSFET transistors IRF520
Would there be info about this on the Raspberry Pi help forum?
What kit did you get the MOSFET from?
Absolutely. Also search for UF2 and Pico and there's a lot of info.
Arduino Starter Kit
It's from 3rd grade.
I uploaded the code as UF2, it is working fine.
Progression
Crayons
Comics
DUPLO
LEGO
Arduino
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First of all I'd like to apologize since the servos are so small they can be run directly from a pin. Still, it's deceiving people to believe other servos too can be powered same way. That's how you kill pins.
Thanks. The kit comes with an Uno, that runs at 5 V. A Pico on the other hand
"The Raspberry Pi Pico operates at 3.3V"
The IRF520 does barely turn on at that voltage. MOSFETs are voltage controlled devices, and this voltage is different for different FETs. It's a lot to take in for a beginner. But when you get hold of the important parameters, a MOSFET is a great tool in your circuit.
The above is also true for the servo. From a datasheet:
"Operating Voltage Range 4.8V to 6V"
You need to address this, your Pico uses 3.3 V, and the servos want more than that. Suggestion from me is to get a couple of MOSFETs that can be controlled with 3.3 V, those in turn can control the servos. Otherwise get a Arduino that uses 5 V.
And I wasn't good at any of them 
Is there a fast solution? I re-uploaded the original code, with the power from 3.3V instead of VBUS, now nothing happens. If the needed voltage is 4.8V at minimum, is there any way I can solve this problem quickly? If not, what MOSFET is recommended, and what would be the schematic and code?
I skipped the first four, barely brushed the fifth, and short-circuited my first Arduino. I don't know how.
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Is the voltage why one of my servos is unresponsive while the other one does nothing and just vibrates/buzzes?
Not really. They usually ends up in release of the "magic smoke".
I'll check. Can you solder SMD components?
No, I only use breadboard.
I also don't have soldering tool or skill.
IRLB8721 is spec'd at 4.5 V, but it starts to conduct at much lower voltage
IRLD024, @ 5 V but also begin conducting at lower voltage.
Those are a couple of MOSFETs I have myself. Not ideal for 3.3 V but should be able to handle those servos.
Thank you
Know anyone that can help you out? Breadboards are great to prototype small circuits but even then, if something malfunctions, they are hard to troubleshoot. Protoboards on the other hand you solder, and get an almost guaranteed connection.
Of those two I think you'll find IRLB8721 easiest to work with. The other don't wanna be inserted all the way into a breadboard, due to the Drain pins being joint together.
None of my friends know coding. I get all my help from the Arduino forum.
What do you mean? Is it like when the wires break or don't connect under the plastic right?