Basics/fix errors

basics.md

@@ -16,7 +16,7 @@ World" in Go.
 {callout="//"}
 <{{src/basics/helloworld.go}}
 
-Lets look at the program line by line. This first line is just required <1>. All
+Let's look at the program line by line. This first line is just required <1>. All
 Go files start with `package <something>`, and `package main` is required for
 a standalone executable.
 
@@ -625,7 +625,7 @@ With `a[:]` <4> we create a slice with all the elements in the array. This is a
 And with `a[:4]` <5> we create a slice with the elements from index
 0 to 3, this is short for: `a[0:4]`, and gives us a slices that contains: `1, 2, 3, 4`.
 With `s2[:]` we create a slice from the slice `s2` <6>, note that `s5` still refers to the array `a`.
-Finally, we create a slice with the elements from index 3 to 3 *and* also set the cap to 4 <7>.
+Finally, we create a slice with the elements from index 2 to 3 *and* also set the cap to 3 instead of 5<7>.
 
 When working with slices you can overrun the bounds, consider this code.
 
@@ -635,7 +635,7 @@ When working with slices you can overrun the bounds, consider this code.
 At <1> we create an array with a 100 elements, indexed from 0 to 99. Then at <2>
 we create a slice that has index 0 to 98. We assign 1 to the 99th element <3> of
 the slice. This works as expected. But at <4> we dare to do the impossible, and
-and try to allocate something beyond the length of the slice and we are greeted
+try to allocate something beyond the length of the slice and we are greeted
 with a *runtime* error: `Error: "throw: index out of range".`
 
 If you want to extend a slice, there are a couple of built-in functions that