* fixing #24573
fixing #24573 - Guide: Let and Const - Unwanted underscores in search result and incorrect URL
- changed underscore to hyphen, same problem was also happening with arrow_functions
https://github.com/freeCodeCamp/freeCodeCamp/issues/24573
* fix: added 3 backticks for code sections
* Translate challenge subtitles and example challenge text to Spanish
* Corrected errors in syntax and punctuation
* Multiple corrections of it/s to its plus other grammar corrections
* Correction and added paragraph to CSS Flex article
* Corrected my own typo
* Corrected capitalization, American spellings and typos
In line #19, I edited the sentence which is meant to say that the computer can not check more than one value at the same time. I added more and deleted some work to get the right translation in Arabic.
* Total change
I changed the definition and the explanation, and make every possibilies of every logical type, and added some pictures of truth table to make the article and the sentences more understandable.
* Article edited
I did correct some translation, and also I added link to let people visualize the code and test other attributes on it.
I will edit this article when I prepare some new things in it, so it become more understandable.