Improve grammar

HISTORY.md

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 # History
 
-Back in January 2012 I wrote 200 lines of C++ code to load up a dictionary, store it in a Trie structure, read up to 7 letters from console input and traverse the Trie structure to find all the words that could be created from provided letters. I did it for 200 PLN (about 60 USD back then) and it was my first money earned by programming (assuming that beer is not a currency).
+Back in January 2012, I wrote 200 lines of C++ code to load a dictionary, store it in a Trie structure, read up to seven letters from console input, and traverse the Trie to find all the words that could be created from the provided letters. I did it for 200 PLN (about 60 USD at that time), and it was my first money earned through programming (assuming that beer is not a currency).
 
-I enjoyed working on it and wanted to enhance that with some visuals to take it to the next level. So I created a simple Windows Forms project in C#, added support for "blank" characters & displayed the results grouped by word length. And I left it like that.
+I enjoyed working on it and wanted to enhance it with some visuals to take it to the next level. So, I created a simple Windows Forms project in C#, added support for "blank" characters, and displayed the results grouped by word length. I left it like that.
 
-Some time later I got familiar with WPF and somehow I got the idea it would be fun to enhance the C# solver with a visual board input. This would provide solver with information which would allow to find a move that will give you the most points. So in September 2014 I started working on a new C# WPF project, but I haven't got far with it.
+Some time later, I became familiar with WPF and thought it would be fun to enhance the C# solver with a visual board input. This would provide the solver with information to find the move that would yield the most points. In September 2014, I started working on a new C# WPF project, but I didn't get far with it.
 
-After getting experienced with JavaScript, I decided to tackle the challenge once again. I started a new project in February 2017. React on the front, node.js in the back. On September 13th 2017, five and a half years since the beginning, `[email protected]` was released. And I saw it was good.
+After gaining experience with JavaScript, I decided to tackle the challenge once again. I started a new project in February 2017, using React on the front end and Node.js on the back end. On September 13, 2017, five and a half years since the beginning, [email protected] was released. And I saw that it was good.
 
-It got to `1.4.0` - I have added en-US & en-GB locales support, a mini tutorial and kept the dependencies up to date (e.g. upgraded React from 15 to 16).
+It reached version 1.4.0, where I added support for en-US and en-GB locales, created a mini tutorial, and kept the dependencies up to date (e.g. upgraded React from 15 to 16).
 
-Frontend development has changed, I've learned a few things - it was time for `[email protected]`. In 2019 I started to work on a new version. But due to many distractions the work took around 2 years to complete. Nevertheless, here it is, a shiny, state-of-the-art frontend app, January 2021 - 9 years after the first project.
+Frontend development has changed, and I've learned a few things - it was time for [email protected]. In 2019, I began working on a new version. However, due to many distractions, the work took around two years to complete. Nevertheless, here it is: a shiny, state-of-the-art frontend app, completed in January 2021 - nine years after the first project.
 
 ## Scrabble Solver 1
 

README.md

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   </p>
 
   <p>
-    Quickly find top scoring words using given board &amp; tiles
+    Quickly find the top-scoring words using the given board and tiles.
   </p>
 
   <p>