Universal converter/adapter/transformer

Hi,

First please forgive my very limited knowledge of electronics.

I live in Canada and am looking for a universal converter/adapter/
transformer (not sure of the term) to replace all the adapters for my
electric stuff (electronic scale, spotlight, rechargeable tools,
etc.). I am wondering what I should buy.

I am very confused about the numbers I see in the Input and Output
sections of the different adapters that I use.

- For the Input section, some of the adapters show only Voltage
while others show Voltage AND Watts.

- For the Output section, Voltage and Amps seem to always there.

Is there a universal adapter that can handle every possible
combination? A good place to buy it?

Is it important to have a universal adapter that can handle different
wattages, os are the Voltage and the Amps the only important numbers?

Thank you.

.

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