diff --git a/site/pages/cmd/advanced/bc.html b/site/pages/cmd/advanced/bc.html
index db0ca58..13c55ba 100644
--- a/site/pages/cmd/advanced/bc.html
+++ b/site/pages/cmd/advanced/bc.html
@@ -11,7 +11,7 @@ next-page: pages/cmd/advanced/colrm.html
 
 In computing, <code>bc</code> is a command in Unix operating systems that can do easy
 calculations in the shell.<br>
-Usually input are passed using the <code>echo</code> command and pipes.
+Usually input is passed in using the <code>echo</code> command and pipes.
 The name stands for <i>Basic Calculator</i>.<br>
 
 <pre>
@@ -21,9 +21,9 @@ echo "(12 / 2 - 3) * 3 + 1.5" | bc
 
 <h3>Interactive mode</h3>
 
-Using the interactive mode makes you do calculations freely in a special shell inside the shell.
+Using the interactive mode lets you do calculations freely in a special shell inside the shell.
 All you need to do is run the bc command with the <code>-i</code> flag
-and no parameter.<br>
+and no parameters.<br>
 To exit the interactive mode, write <i>quit</i>.
 
 <pre>
diff --git a/site/pages/cmd/advanced/colrm.html b/site/pages/cmd/advanced/colrm.html
index ce8d746..e671642 100644
--- a/site/pages/cmd/advanced/colrm.html
+++ b/site/pages/cmd/advanced/colrm.html
@@ -8,7 +8,7 @@ title: colrm
 previous-page: pages/cmd/advanced/bc.html
 next-page: pages/cmd/advanced/comm.html
 ---
-The <code>colrm</code> is a command that removes the column that you indicate <br>
+<code>colrm</code> is a command that removes the column that you indicate <br>
 
 Here we have a file named <code>example.txt</code> that contains two lines to test this command:<br>
 
@@ -28,13 +28,13 @@ colrm 4 &lt; example.txt
     abc
 </pre>
 
-How you can see, if I don't indicate the last column, the command removes
-all the colums starting from 4 included.
+As you can see, if I don't indicate the last column, the command removes
+all the columns starting from 4 included.
 <pre>
 colrm 2 4 &lt; example.txt
     156789
     aefghi
 </pre>
 
-Here, how you can see, the command has removed not all the columns, but only the colums that
-starting at 2 and ending at 4, included.
+Here, as you can see, the command has not removed all the columns, but only the columns that
+between 2 and 4, inclusive
diff --git a/site/pages/cmd/advanced/comm.html b/site/pages/cmd/advanced/comm.html
index f28c35f..4e8e810 100644
--- a/site/pages/cmd/advanced/comm.html
+++ b/site/pages/cmd/advanced/comm.html
@@ -9,10 +9,10 @@ previous-page: pages/cmd/advanced/colrm.html
 next-page: pages/cmd/advanced/diff.html
 ---
 The <code>comm</code> is a command that compares two sorted files
-line by line and writes the output: the lines that are in common and the lines that are unique.<br>
+line by line and writes the output: the lines they have in common and the lines that are unique.<br>
 
 Here we have two files named <code>example1.txt</code> and
-<code>example2.txt</code> that contain 5 elements, to test this command:<br>
+<code>example2.txt</code> that each contain 5 elements, to test this command:<br>
 
 <code>example1.txt</code>
 {% highlight bash %}
@@ -34,7 +34,7 @@ Pizza
 
 The syntax command is:
 <pre>
-comm [flag][file1] [file2]
+comm [flag] [file1] [file2]
 </pre>
 
 <pre>
@@ -50,14 +50,14 @@ comm example1.txt example2.txt
 
 <ul>
     <li>The elements of the first file have less indentation.</li>
-    <li>The elements of the second file have some more indentation.</li>
-    <li>The elements in common have even more indentation than those of the second file.</li>
+    <li>The elements of the second file are more indented</li>
+    <li>The elements in common are even more indented than those of the second file.</li>
 </ul>
 
 <h3>Flags</h3>
 
 <ul>
-  <li> <b>-1</b>: supress column 1</li>
-  <li> <b>-2</b>: supress column 2</li>
-  <li> <b>-3</b>: supress column 3</li>
+  <li> <b>-1</b>: suppress column 1</li>
+  <li> <b>-2</b>: suppress column 2</li>
+  <li> <b>-3</b>: suppress column 3</li>
 </ul>
diff --git a/site/pages/cmd/advanced/diff.html b/site/pages/cmd/advanced/diff.html
index 65658df..0ccbbb7 100644
--- a/site/pages/cmd/advanced/diff.html
+++ b/site/pages/cmd/advanced/diff.html
@@ -9,7 +9,7 @@ previous-page: pages/cmd/advanced/comm.html
 next-page: pages/cmd/advanced/echo.html
 ---
 
-The command <code>diff</code> analyzes two files and prints the lines that are different.
+The <code>diff</code> command analyzes two files and prints the lines that are different.
 Essentially, it outputs a set of instructions for how to change one file to
 make it identical to the second file.<br>
 
diff --git a/site/pages/cmd/advanced/echo.html b/site/pages/cmd/advanced/echo.html
index cf94feb..bb823dd 100644
--- a/site/pages/cmd/advanced/echo.html
+++ b/site/pages/cmd/advanced/echo.html
@@ -10,13 +10,13 @@ next-page: pages/cmd/advanced/emacs.html
 ---
 
 In computing, <code>echo</code> is a command in Unix operating systems that outputs the
-strings it is being passed as arguments.<br>
+strings that are passed to it as arguments.<br>
 
 It is a command typically used to output status text to the screen or a
 computer file, or as a source part of a pipeline.<br>
 
-To use this simple command just type "echo" with the topic we want to
-print. The computer will return your argument as a string
+To use this simple command just type "echo" with the topic you want to
+print. The computer will return your argument as a string.
 
 <pre>
 echo "hello world"
diff --git a/site/pages/cmd/advanced/grep.html b/site/pages/cmd/advanced/grep.html
index cc41e4f..16ac4a1 100644
--- a/site/pages/cmd/advanced/grep.html
+++ b/site/pages/cmd/advanced/grep.html
@@ -8,10 +8,10 @@ title: grep
 previous-page: pages/cmd/advanced/emacs.html
 next-page: pages/cmd/advanced/head-tail.html
 ---
-The <code>grep</code>  is a command that permits to search occurences of a
-keyword or more in a file or more. Through some flags you can decide the search criteria.
+<code>grep</code> is a command that allows you to search occurrences of one or more
+keywords in one or more files. Through some flags you can decide on the search criteria.
 The command grep is case sensitive (robot is different from Robot), but we will see how
-to ignore it.<br>
+to ignore that.<br>
 
 Here we have two files named <code>example1.txt</code> and
 <code>example2.txt</code> that contain 5 elements, to test this command:
@@ -50,7 +50,7 @@ Your output will be this because grep found the keyword Robot in both files
 Here a list that contains the main flags of these command:
 
 <ul>
-    <li> <b>-i</b>: this flag ignore the case sensitive. Here we can write Robot or
+    <li> <b>-i</b>: this flag ignores case sensitivity. Here we can write Robot or
         robot that grep will find the correspondence.
 <pre>
 grep -i robot example1.txt example2.txt
@@ -59,7 +59,7 @@ grep -i robot example1.txt example2.txt
 </pre>
     </li>
 
-    <li> <b>-v</b>: this flag ignore the keyword from the search.
+    <li> <b>-v</b>: this flag ignores the keyword from the search.
 <pre>
 grep -i -v robot example1.txt example2.txt
     example1.txt:Car
@@ -86,6 +86,6 @@ grep -i -c robot example1.txt
 grep -i -h apple example1.txt example2.txt
     Apple
 </pre>
-    How you can see the output doesn't show tha file name <code>example2.txt</code>
+    How you can see the output doesn't show the file name <code>example2.txt</code>
     </li>
 </ul>