Power supply and equipment that I should have to fit all small electronic projects
Based on the helpful comments I did understand a little better what I should be aiming for, what I ended up buying (will update this answer when everything is delivered and tested):

12v Volt 600W Power Supply Transformers Drivers Ac Dc Adapters (this one), so I can have a low voltage, high amp power supply.

also got a ANGEEK 300W 20A DC-DC Wandlermodul Step Down Voltage (this one) so I can use the 12v power supply for things that require a lower voltage with an output of 20 amp (more than enough to cover my needs).

of course you will need a digital multimeter to make sure that everything is correct.