ESP32 and IDF: UART pin selection, GPIO, pin numbers and tutorials

Hi I am starting to use ESP 32 idf. But I have some problems and questions.
1. they state that there are 3 uart and I only see 1 https://docs.espressif.com/projects/esp-idf/e...est/esp32/_images/esp32-devkitC-v4-pinout.png.
2. with these esp and programming in idf is it so that you can choose any pin ? That for example the uart does not have to be permanently in one place ?
If so, what happens to the pin from which we redirected the uart ? Can it be used or is it wasted ?
3 If it is as I write in point 2, which pin numbers should I look at ? the gpio in green or the ones on the board ?
4 There are some cool tutorials for this. Because I can't find any that make sense maybe I'm looking wrong ?
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kamil3211 wrote:

They state that there are 3 uart and I only see 1 https://docs.espressif.com/projects/esp-idf/e...est/esp32/_images/esp32-devkitC-v4-pinout.png.

Better drawing and detailed pin description: Link
Yes, there are 3 UART controllers available.

kamil3211 wrote:

Is it so with these esp and programming in idf that you can choose any pin ? That e.g. the uart does not have to be fixed in one place ?

Yes, the pin assignment to the UART can be changed programmatically. Link

kamil3211 wrote:

There are some cool tutorials for this. Because I can't find any sensible ones maybe I am looking wrong ?

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Link
Link

I would still like to ask if you have also perhaps used the arduino ide for the esp32. How does it compare to the idf?
Is it possible to do something more difficult there than flashing a diode in arduino ide ? If there was no idf would you then choose it as an alternative ?

kamil3211 wrote:

Is it possible to do something more difficult there than flashing an LED in an Arduino ide ?

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Yes There is a pretty extensive list of examples of ESP32 programming in the Arduino environment on that page I linked to in the previous post.

kamil3211 wrote:

If there was no idf would you then choose it as an alternative ?

Arduino Core for ESP32 is based on ESP-IDF, so you can use both solutions for "arduino" projects.

Is there any converter from arduino to esp idf code ? Since these are overlays ?

kamil3211 wrote:

Is there any converter from arduino to esp idf code ?

Yes .
Link