Small spelling fixes

1-js/02-first-steps/04-variables/article.md

@@ -314,7 +314,7 @@ And the last note. There are some lazy programmers who, instead of declaring a n
 
 As the result, the variable is like a box where people throw different things without changing the sticker. What is inside it now? Who knows... We need to come closer and check.
 
-Such a programmer saves a little bit on variable declaration, but looses ten times more on debugging the code.
+Such a programmer saves a little bit on variable declaration, but loses ten times more on debugging the code.
 
 An extra variable is good, not evil.
 

1-js/02-first-steps/05-types/article.md

@@ -1,14 +1,14 @@
 # Data types
 
-A variable in JavaScript can contain any data. A variable can at one moment be a string and later recieve a numeric value:
+A variable in JavaScript can contain any data. A variable can at one moment be a string and later receive a numeric value:
 
 ```js
 // no error
 let message = "hello";
 message = 123456;
 ```
 
-Programming languages that allow such thing are called "dynamically typed", meaning that there are data types, but variables are not bound to any of them.
+Programming languages that allow such things are called "dynamically typed", meaning that there are data types, but variables are not bound to any of them.
 
 There are 7 basic data types in JavaScript. Here we'll study the basics, and in next chapters we'll talk about each of them in detail.