Electronic – Male/female wire connectors – How to tell AWG/mm^2 rating

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So I have a project where I will be running 20 AWG wires. Now there will be one section where I will need to connect the wires with a male/female connector.

I'm having trouble identifying which connectors should do the job safely, as I prioritise safety first.

How does one figure this out? When I type in "male female 2 pin connector" on Aliexpress I get a lot of results, but it's never stated for which wire gauges the connectors are for!

I also keep hearing about "pitch", i.e. "SM2.54 Kits 25 sets Kit in box 2p 3p 4p 2.54mm Pitch Female and Male Header Connectors Adaptor". In the example here "2.54mm pitch", what does that mean?