M site/contents/learn.md → site/contents/learn.md

@@ -19,17 +19,17 @@ (1 4 9 16 25)
 
 Let's see how it works:
 
-1. First a list containing the first five integer is pushed on the stack.
-2. Then, another list containing two symbols (`dup` and `*`) is pushed on the stack. This constitutes a quoted program which, when executed duplicates the first element on the stack —this is done by `dup`— and then multiplies —with `*`— the two elements together.
+1. First, a list containing the first five integers is pushed on the stack.
+2. Then, another list containing two symbols (`dup` and `*`) is pushed on the stack. This constitutes a quoted program which, when executed duplicates the first element on the stack — this is done by `dup`— and then multiplies — with `*`— the two elements together.
 3. Finally, the symbol `map` is pushed on the stack. Map takes a list of elements and a quoted program and applies the program to each element.
 
 Note that:
 
 * There are no variable assignments.
 * elements are pushed on the stack one by one.
-* Parentheses are used to group together one or more elements, so that they are treated as a single element and they are not evaluated immediately.
+* Parentheses are used to group one or more elements together so that they are treated as a single element and they are not evaluated immediately.
 * *Symbols* (typically single words, or several words joined by dashes) are used to execute code that performs operations on the whole stack.
 
-Unlike more traditional programming languages, in a concatenative programming language there is no inherent need of variables or named parameters, as symbols acts as stack operators that consume elements that are placed in order on top of a stack.
+Unlike more traditional programming languages, in a concatenative programming language, there is no inherent need for variables or named parameters, as symbols act as stack operators that consume elements that are placed in order on top of a stack.
 
 {#link-learn||data-types||Data Types#}