ArduinoCore-API VS Ethernet

If you want to really learn it I'd recommend Bro Codes C guide, that'll make it easier to understand, his C++ guide is a bit longer but once you know C++ it's a matter of going to the Arduino references and looking for the function you need.

First, go to the Language Reference, which defines exactly what the commands do.

A great way to introduce yourself to the syntax of C/C++ and, more specifically the various functions and capabilities of the Arduino is to go through the documentation's Reference page on the company's website and read through each function and keyword. By the end of the page you'll have a solid overview of the capabilities of the platform and a certain amount of familiarity on how to use them.

You need a Serial.begin and a Serial.println to see something on the Serial monitor. Have a look at the documentation or some sample programs to see these statements. If you don't have Serial.print statements, nothing will display because you are not asking for anything to be displayed. As for the gibberish when you reset, it is possible these are remnants from an old program. Make sure the value supply to begin matches your serial monitor's baud rate setting (i.e. 9600 from your original post).

You might want to have a look at the documentation.

If you study the Arduino Language Reference, you'll find |=, <<, >>.

The arduino documentation is (or was back when i did a lot of work with arduinos) very thorough. Book mark the reference material https://www.arduino.cc/reference/en/ its very handy to have close at hand.

Arduino Reference - Arduino Reference what i usually scroll through to get me through any projects and i started off same place as you not knowing anything about coding and it got me through most of the projects i started. best to just keep making mistakes though and eventually the sketch will compile.

You can find what you need to start programming with Arduino on this page: https://www.arduino.cc/reference/en/

arduino.cc has a lot of tutorials!

I was gonna say the arduino.cc site but that works too.

When you write your code and compile it, what environment are you doing it in? Are you using an online cloud service like arduino.cc's IoT cloud? Or have you downloaded and installed the Arduino IDE application from arduino.cc's software download page?

There are tons of libraries for the Arduino platform that people have written and there are many available for use with this module, so you don't have to do any super heavy lifting programming-wise. In the Arduino IDE you can download from arduino.cc I installed a couple of libraries just now as a test. The reason I installed them is because almost every library comes with several short example programs showing how to use the various features that their library offers.

Did all of it make sense? Could you do the projects he shows by yourself without starting and stopping the video? That might show areas that you would want to brush up on. Another great idea is to go through all of the commands on the arduino.cc language reference page. Make sure you instinctively understand what each function listed does and experiment with any that you aren't familiar with.

There are also IoT cloud style dashboards at places like arduino.cc that let you add various widgets for dials and controls to represent the data you have locally with your Arduino.

Mentioned at arduino.cc. Designed to generate a periodic interrupt, I'll have to code a little state machine to change the interval at every firing.

Without a good explanation from them I really wouldn't put much stock in it. If anything they're probably just trying to steer people away from CH340 devices in part because they are problem children and because arduino.cc themselves don't use them.

Ontop of this, step 3 and 5 are a must in learning. And don't think "it's just blinking, lame" think more of "what can I do with this?" Use arduino.cc for reference.