Hello vipul patel,
You can categorize or tag the posts then use FilterExpression property to create filtered list of content items.
Another option - which is the better one is creating a custom metafields where you specify the post topic which will be used as a filter key. Then create a custom control that inherits from BlogPosts and override CreateDataSource where you can use ContentFilterBilder to filter the data
ContentFilterBuilder filterBuilder =
.SortExpression, filterBuilder.ParseTagFilter(), 1,
, filterBuilder.ParseParentsFilter(), filterBuilder.ParseMetaFieldsFilter());
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