Where's the best place to learn; phone repair?
Because I only can find courses that spans for few days.

Is the 3 days course sufficient?

Once I'm able to repair, I want to buy spoiled phone and repair for fun.

Thanks 😊 👍

If you have basic electronic knowledge, then easier to learn. Otherwise, go work for 6-12 months as apprentice

If you must dabble in SMD, best way without spending too much is by using a good heat gun and precision tweezers. Add good amount of flux on top of solder and let the component slide to place while you heat the area up.

Of course need good control of heat otherwise risk damaging the entire thing without even knowing

can you replace smd components? any tips? i need to replace an smd mosfet, capacitor, resistors

If the technician total loss the device when it should be repairable, then how?