@r4z3r You have to edit the template. Subcategory description is available in the template.
Like here in Nodebb Category: Plugins
{
"cid":7,
"name":"NodeBB Plugins",
"description":"Discussion regarding NodeBB Plugin development.",
"icon":"fa-wrench",
"slug":"7/nodebb-plugins",
"topic_count":1041,
"order":4,
"bgColor":"#333",
"link":"",
"class":"col-lg-4 col-md-6 col-xs-12",
"numRecentReplies":1,
"color":"#ffffff",
"post_count":10510,
"descriptionParsed":"<p>Discussion regarding NodeBB Plugin development.</p>\n",
"subCategoriesPerPage":10,
"minTags":0,
"maxTags":5,
"postQueue":1,
"parentCid":0,
"disabled":0,
"isSection":0,
"totalPostCount":12763,
"totalTopicCount":1550,
"tagWhitelist":[
],
"unread-class":"",
"children":[
{
"cid":17,
"name":"Plugin Development",
"description":"Have a question about building a plugin? Ask here",
"icon":"fa-wrench",
"bgColor":"#DC9656",
"color":"#ffffff",
"slug":"17/plugin-development",
"parentCid":7,
"topic_count":322,
"post_count":1419,
"disabled":0,
"order":14,
"link":"",
"numRecentReplies":1,
"class":"col-md-3 col-xs-6",
"imageClass":"auto",
"subCategoriesPerPage":10,
"minTags":0,
"maxTags":5,
"postQueue":1,
"isSection":0,
"totalPostCount":1419,
"totalTopicCount":322,
"descriptionParsed":"Have a question about building a plugin? Ask here",
"tagWhitelist":[
],
"unread-class":"",
"parent":{
"cid":7,
"name":"NodeBB Plugins",
"description":"Discussion regarding NodeBB Plugin development.",
"icon":"fa-wrench",
"slug":"7/nodebb-plugins",
"topic_count":1041,
"order":4,
"bgColor":"#333",
"link":"",
"class":"col-lg-4 col-md-6 col-xs-12",
"numRecentReplies":1,
"color":"#ffffff",
"post_count":10510,
"descriptionParsed":"<p>Discussion regarding NodeBB Plugin development.</p>\n",
"subCategoriesPerPage":10,
"minTags":0,
"maxTags":5,
"postQueue":1,
"parentCid":0,
"disabled":0,
"isSection":0,
"totalPostCount":10510,
"totalTopicCount":1041,
"tagWhitelist":[
],
"unread-class":""
},
"posts":[
{
"pid":82335,
"timestamp":1617367530536,
"content":"<p dir=\"auto\"><a class=\"plugin-mentions-user plugin-mentions-a\" href=\"https://community.nodebb.org/uid/21579\">@ape</a> the standard way to get nodebb modules is require.main.require</p>\nconst Posts = require.main.require('./src/posts');\nPosts.getPostData(pid, callback)\n",
"timestampISO":"2021-04-02T12:45:30.536Z",
"user":{
"uid":3076,
"username":"PitaJ",
"userslug":"pitaj",
"picture":"https://i.imgur.com/Dj8Fe85.png",
"displayname":"PitaJ",
"icon:text":"P",
"icon:bgColor":"#e65100"
},
"index":4,
"cid":17,
"topic":{
"slug":"15505/script-to-display-all-posts-by-_id",
"title":"Script to display all posts by _id"
}
}
]
},
{
"cid":18,
"name":"Plugin Requests",
"description":"Need a plugin developed? Ask here!",
"icon":"fa-comments",
"bgColor":"#BA8BAF",
"color":"#ffffff",
"slug":"18/plugin-requests",
"parentCid":7,
"topic_count":187,
"post_count":834,
"disabled":0,
"order":18,
"link":"",
"numRecentReplies":1,
"class":"col-md-3 col-xs-6",
"imageClass":"auto",
"subCategoriesPerPage":10,
"minTags":0,
"maxTags":5,
"postQueue":1,
"isSection":0,
"totalPostCount":834,
"totalTopicCount":187,
"descriptionParsed":"Need a plugin developed? Ask here!",
"tagWhitelist":[
],
"unread-class":"",
"parent":{
"cid":7,
"name":"NodeBB Plugins",
"description":"Discussion regarding NodeBB Plugin development.",
"icon":"fa-wrench",
"slug":"7/nodebb-plugins",
"topic_count":1041,
"order":4,
"bgColor":"#333",
"link":"",
"class":"col-lg-4 col-md-6 col-xs-12",
"numRecentReplies":1,
"color":"#ffffff",
"post_count":10510,
"descriptionParsed":"<p>Discussion regarding NodeBB Plugin development.</p>\n",
"subCategoriesPerPage":10,
"minTags":0,
"maxTags":5,
"postQueue":1,
"parentCid":0,
"disabled":0,
"isSection":0,
"totalPostCount":10510,
"totalTopicCount":1041,
"tagWhitelist":[
],
"unread-class":""
},
"posts":[
{
"pid":82295,
"timestamp":1617018854196,
"content":"<p dir=\"auto\"><a class=\"plugin-mentions-user plugin-mentions-a\" href=\"https://community.nodebb.org/uid/2\">@julian</a> Hello it doesn't work</p>\n",
"timestampISO":"2021-03-29T11:54:14.196Z",
"user":{
"uid":20901,
"username":"Amir_4",
"userslug":"amir_4",
"picture":"https://lh3.googleusercontent.com/a-/AOh14Ggw_1MviR2iNN1v-cvJSjfUp7weiHzhphjKFVs6=s96-c",
"displayname":"Amir_4",
"icon:text":"A",
"icon:bgColor":"#33691e"
},
"index":3,
"cid":18,
"topic":{
"slug":"15479/steam-login",
"title":"Steam login"
}
}
]
}
],
"posts":[
{
"pid":82348,
"timestamp":1617481846069,
"content":"<p dir=\"auto\"><a class=\"plugin-mentions-user plugin-mentions-a\" href=\"https://community.nodebb.org/uid/1\">@baris</a> Ok that's a understandable point. 馃憤 I try to understand it. Thank you for your help. 馃憤</p>\n",
"timestampISO":"2021-04-03T20:30:46.069Z",
"user":{
"uid":19253,
"username":"dogs",
"userslug":"dogs",
"picture":"/assets/uploads/profile/19253-profileavatar-1609661611394.jpeg",
"displayname":"dogs",
"icon:text":"D",
"icon:bgColor":"#827717"
},
"index":6,
"cid":7,
"topic":{
"slug":"13368/get-user-data-from-a-custom-field",
"title":"Get user data from a custom field"
}
}
],
"teaser":{
"url":"/post/82348",
"timestampISO":"2021-04-03T20:30:46.069Z",
"pid":82348,
"topic":{
"slug":"13368/get-user-data-from-a-custom-field",
"title":"Get user data from a custom field"
}
}
},
You can edit the corresponding template.
Lets say its yourtheme/templates/categories.tpl
You can access these data inside your theme file like so:
{{{each categories}}}
<!-- loops trough the categories array -->
{{{ each categories.children }}}
<!-- loops trough the current categories children array -->
<!-- prints out children category name -->
<h3>{categories.children.name}</h3>
{{{ end }}}
{{{end}}}
Result:
Here are my categories:
This is the rendered template:
You can view available and accessable data if you prepend api to the route.
Route:
https://community.nodebb.org/topic/15523/enable-subcategory-description-in-main-page
API Route with data:
https://community.nodebb.org/api/topic/15523/enable-subcategory-description-in-main-page
So in your case you have two fields available:
"description": "Its a short description here.",
"descriptionParsed": "<p dir=\"auto\">Its a short description here.</p>\n"
And you can use this in your template too. Here I use description not descriptionParsed:
{{{each categories}}}
<!-- loops trough the categories array -->
{{{ each categories.children }}}
<!-- loops trough the current categories children array -->
<!-- prints out children category name -->
<h3>{categories.children.name}</h3>
<!-- Check if description for that subcat is available or not -->
{{{ if categories.children.description}}}
<p>{ categories.children.description }</p>
{{{ end }}}
{{{ end }}}
{{{end}}}
The second Subcat has no description. So there it is empty:
gallery preview
Using Third-Party Libraries - NodeBB Documentation
You can view the 3d models on mobile devices like a boss. Full responsive. 
