Where to start work with Nordic

Hi
I would like some advice on where to start learning Nordic BLE?

All I could find by searching was advice from 6-9 years ago, I think today they are not relevant, because there are some new development tools..

I found this board: Nordic Semiconductor nRF52840-DK, are two of these boards enough for me to start learning without buying any programmers and debugging devices?

And what software (development environment) is better to use?

I know the basics of BLE operation, I will study it in more depth...

People who understand said that if you want to work with BLE, then only Nordic.

Sorry if I wrote in the wrong topic

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