What's the easiest programming language to learn ??

You are asking programming language in PLC section, this is whole other thing.
First you have to be clear about Computer Programming and PLC Programming.
If you are interested in Computers, then there are lot of programming languages, you can choose, C (for software designing purpose), BASIC (programming ideas), HTML (website designing), COBOL (Business programming), FROTRAN/PASCAL (for Engineering programming) etc.
Then only Boolean decision making / Ladder logic is available for PLC, through variety of PLC up-loader software.

ladder for plc

Tbh I don't think there is THE ONE easiest programming language to learn.
For sure C is a good example but soon it reaches its limits.
Defining the difficulty of a programming language cannot be reduced to the language itself, but to the massive amount of frameworks coming with it.
The basics of programming can be learned with every language because they all follow the same idea and if you read books teaching the different languages they nearly all follow the same pattern.
So in my opinion never ask "Which is the easiest?" but "What do I want to achieve in the future?", because for newcomers it can be more difficult to change the language than starting of the scratch.
With more experience it will become easier to switch but there are always hurdles to take.
Never ask for the easiest way but for the goal and choose the best way.
And without blaming anyone HTML is not a programming language ;)

html cpp

I think you just need to have core concepts and then you will find no language difficult......
but to start best would be C.
I first started with core programming concepts then learned C/C++, Now I have worked with Java, PHP, Python, RUby and many more ....

Well i think we don't have to say easy or hard because you love or you have detrmination of any language you will do very well for me i think html , cpp, java is very easy and simple but java it's very sensitive syntax you have to be careful when you use it Also, ASP.NET & VB.NET is very good to design web sites

From my personal experience I would say C programming.
It is easy and once you get the concept of programming through C you'll be able to immigrate to many other programming languages easily.

both

python3 is easy to learn and you can create a big project Like "OpenOffice.org"