Improve function descriptions

content/en/functions/strings/SliceString.md

@@ -1,20 +1,26 @@
 ---
 title: strings.SliceString
-description: Creates a slice of a half-open range, including start and end indices.
+description: Returns a substring of the given string, beginning with the start position and ending before the end position.
 categories: []
 keywords: []
 action:
   aliases: [slicestr]
-  related: []
+  related:
+    - functions/strings/Substr
   returnType: string
-  signatures: ['strings.SliceString STRING START [END]']
+  signatures: ['strings.SliceString STRING [START] [END]']
 aliases: [/functions/slicestr]
 ---
 
-For example, 1 and 4 creates a slice including elements 1 through 3.
-The `end` index can be omitted; it defaults to the string's length.
+The START and END positions are zero-based, where `0` represents the first character of the string. If START is not specified, the substring will begin at position `0`. If END is not specified, the substring will end after the last character.
 
 ```go-html-template
+{{ slicestr "BatMan" }}` → BatMan
 {{ slicestr "BatMan" 3 }}` → Man
 {{ slicestr "BatMan" 0 3 }}` → Bat
 ```
+
+The START and END arguments represent the endpoints of a [half-open interval], a concept that may be difficult to grasp when first encountered. You may find that the [`strings.Substr`] function is easier to understand.
+
+[half-open interval]: /getting-started/glossary/#interval
+[`strings.Substr`]: /functions/strings/substr/