diff --git a/components/category-badge.tsx b/components/category-badge.tsx
index 83d25e2..8369239 100644
--- a/components/category-badge.tsx
+++ b/components/category-badge.tsx
@@ -11,8 +11,20 @@ type CategoryTypes =
   | 'Lifestyle'
   | 'Gadgets'
   | 'Other';
+const ALL_CATEGORIES = [
+  'Technology',
+  'Programming',
+  'Productivity',
+  'Lifestyle',
+  'Gadgets',
+  'Other',
+];
 
-const toPascalCase = (str: string): CategoryTypes => {
+function isSuit(value: string) {
+  return ALL_CATEGORIES.includes(value);
+}
+
+const toPascalCase = (str: string) => {
   return [str]
     .map((word) => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase())
     .join('');
@@ -20,5 +32,8 @@ const toPascalCase = (str: string): CategoryTypes => {
 
 export const CategoryBadge = ({ badgeString }: Props) => {
   const bs = badgeString ? toPascalCase(badgeString) : 'Other';
+  if (!isSuit(bs)) {
+    return <Badge variant="secondary">Other</Badge>;
+  }
   return <Badge variant="secondary">{bs}</Badge>;
 };
diff --git a/content/posts/sample.mdx b/content/posts/sample.mdx
index efd35b7..2128da1 100644
--- a/content/posts/sample.mdx
+++ b/content/posts/sample.mdx
@@ -51,9 +51,9 @@ This is a sample post. [^1]
 ## Table
 
 | Name | Age | Sex |
-| :---- | :---: | ---: |
-| John | 20  | M   |
-| Jane | 22  | F   |
+| :--- | :-: | --: |
+| John | 20  |   M |
+| Jane | 22  |   F |
 
 ## Lists
 
diff --git a/public/robots.txt b/public/robots.txt
new file mode 100644
index 0000000..4d04f33
--- /dev/null
+++ b/public/robots.txt
@@ -0,0 +1,9 @@
+# *
+User-agent: *
+Allow: /
+
+# Host
+Host: https://www.funailog.com
+
+# Sitemaps
+Sitemap: https://www.funailog.com/sitemap.xml
diff --git a/public/sitemap-0.xml b/public/sitemap-0.xml
new file mode 100644
index 0000000..c5f5c5a
--- /dev/null
+++ b/public/sitemap-0.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:mobile="http://www.google.com/schemas/sitemap-mobile/1.0" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1">
+<url><loc>https://www.funailog.com/api/hello</loc><lastmod>2024-03-18T18:37:11.897Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://www.funailog.com</loc><lastmod>2024-03-18T18:37:11.897Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://www.funailog.com/about</loc><lastmod>2024-03-18T18:37:11.897Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://www.funailog.com/posts/sample</loc><lastmod>2024-03-18T18:37:11.897Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+<url><loc>https://www.funailog.com/posts/without-category-post</loc><lastmod>2024-03-18T18:37:11.897Z</lastmod><changefreq>daily</changefreq><priority>0.7</priority></url>
+</urlset>
\ No newline at end of file
diff --git a/public/sitemap.xml b/public/sitemap.xml
new file mode 100644
index 0000000..da3d070
--- /dev/null
+++ b/public/sitemap.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+<sitemap><loc>https://www.funailog.com/sitemap-0.xml</loc></sitemap>
+</sitemapindex>
\ No newline at end of file