Wrong Idiom

The idiom "on the other hand" does not work here.

First, it requires the use of "on one hand" prior.
Secondly, this is not an appropriate use of the idiom.  "In contrast" seems more coherent and clear in this context.

Author: ElvannAbendroth

src/content/2/en/part2c.md

@@ -104,7 +104,7 @@ notes.forEach(m => {
 
 In Java, the code executes line by line and stops to wait for the HTTP request, which means waiting for the command _request.get(...)_ to finish. The data returned by the command, in this case the notes, are then stored in a variable, and we begin manipulating the data in the desired manner.
 
-On the other hand, JavaScript engines, or runtime environments, follow the [asynchronous model](https://developer.mozilla.org/en-US/docs/Web/JavaScript/EventLoop). In principle, this requires all [IO operations](https://en.wikipedia.org/wiki/Input/output) (with some exceptions) to be executed as non-blocking. This means that code execution continues immediately after calling an IO function, without waiting for it to return.
+In contrast, JavaScript engines, or runtime environments follow the [asynchronous model](https://developer.mozilla.org/en-US/docs/Web/JavaScript/EventLoop). In principle, this requires all [IO operations](https://en.wikipedia.org/wiki/Input/output) (with some exceptions) to be executed as non-blocking. This means that code execution continues immediately after calling an IO function, without waiting for it to return.
 
 When an asynchronous operation is completed, or, more specifically, at some point after its completion, the JavaScript engine calls the event handlers registered to the operation.