It sounds like the simplest and most flexible approach is to find a plugin that creates a widget for you that you can configure to display any post of your choosing in whatever fashion you prefer. Then you put that widget in the sidebar that appears on all of your pages. I would not develop this custom because it is an obvious problem that others have solved many times over.
In other words, there are plugins out there that do just this. For example, I found a couple of plugins in a Google search: Ultimate Posts Widget and Flexible Posts Widget. Many robust theme frameworks also include this feature, such as Themify, just to name one.
A second approach in the same vein is to install the Display Posts Shortcode plugin, and then put one of their configurable shortcodes into a Text widget that resides in your sidebar.
Related Posts:
- Front page should display only one category of posts including sticky post with custom featured post box
- Show image if a post is featured
- Exclude sticky post from main query?
- Show Sticky Posts in Category Archive
- Set sticky posts schedule (Automatic)
- Display only the most recent sticky post, display other posts in chronological order
- Include sticky posts in ‘Blog pages show at most’ X number of posts?
- Exclude expired sticky posts
- Exclude Sticky posts from Main Query break Pagination
- How to remove sticky post capability for a specific user role?
- ignore_sticky_posts in WordPress 3.0.3?
- Exclude Current and Sticky Post
- Make sticky post on save
- How to display only feautured/sticky listings on the homepage
- Pin a post to the top of a page, other than the home page
- Why WordPress CMS uses an array in wp_options instead of a field for Sticky posts?
- ignore_sticky_posts not working with word press version 3.9.1
- How to automate featured posts number? [duplicate]
- How to modify query on category pages to show only sticky posts?
- Make posts non-sticky
- Check if parent post is sticky on attachment page?
- How to check a post is sticky or not yet?
- Custom query: how to get the sticky posts first?
- I would like to change the sticky posts label “Featured” to something else
- How to display sticky post with custom html
- Update a post to remove sticky option
- I do not want my front page sticky post to show up in a category
- How to display a sticky post inside a div?
- WooThemes Mini Features – modify query_posts to display only sticky_posts
- Exclude Sticky Posts as everyone!
- Don’t move sticky posts to the first page
- Latest Sticky Posts with Grid Thumbnails for static front page
- Remove old sticky post on publish
- Limit Number of Sticky Posts to Show
- get_option(‘sticky_posts’) returns stickies that are in trash
- Display latest sticky post or display nothing
- Create thumbs only when a post is sticky or any other way?
- How can I display only sticky posts from a parent category on the homepage?
- Images for sticky posts
- How to add “Stick this post to the front page” to front end?
- Code to make a post sticky
- Using categories & “stickyness” together
- XMLRPC and Underscored custom fields
- Disable sticky posts feature
- Three different post types on homepage
- Apply styling only to first page sticky posts
- All sticky posts are returned in custom query
- Get the size (size in Kb or MB) of an featured image?
- Include a specific post to the query_posts and remove it if it is already in the returned list
- Excluding Sticky Posts from The Loop and from WP_Query() in WordPress?
- “Issues” loading MANY featured images on a single page (custom template)
- Exclude posts from homepage having a specified tag
- Get the 5 lastest Featured Posts from a category
- Hide featured post on second page
- how to exclude “featured” posts from the main loop?
- How to get 1 or 2 specific posts on top of my wordpress blog?
- Stick multiple posts in a single category
- Variable if post is sticky in functions.php
- Keep sticky posts out of query unless they have featured image
- How to use photo in multiple posts?
- Display Featured Post by Categories and Avoid duplicated posts
- Media Gallery Upload photo incorrect way like glitch
- Blog page Server error 500 with stick post loop in query.php
- WP Query to have sticky posts first, with pagination and having a joint ‘posts per page’ arg with main loop
- How do I style the first two posts of a loop
- Setup Featured image on all posts from thesis thesis_post_image custom field?
- WordPress: Notice:Object of class WP_Query could not be converted to int in on line
- How can I allow sticky posts but cap the query to 1 post?
- Exclude all sticky posts front page twenty twelve
- Exclude first post (sticky or not) from the loop using query_posts()
- Featured-Content/Featured Posts With Random Order
- Display image for first sticky post only
- How do I link a featured photo to it’s post?
- Filter article that has featured image to shown on homepage [duplicate]
- How can I specify the width and height of the Featured Image in TwentyTwelve theme?
- show div only if have a related post inside
- wordpress query_posts featured page always on top
- WordPress : how to allow a user to post a module that leads any visitor to a product page ? (front end)
- How do you get sticky posts to work with categories?
- Pin posts to top of custom loop
- Sticky Post Doesn’t always work
- Get attachment thumbnail from get_posts function
- How to pull sticky post permalink inside php?
- Function for Sticky Post on Categories causes issues with 404 behavior
- Make sticky post with FacetWP
- WP site homepage displays url link at beginning of each featured post
- why ignore_sticky_posts in sticky post query
- How to have a different section for a special category of posts in landing page?
- Sticky post of current viewing author?
- Trying to Exclude Sticky Posts From date_query
- Blog Displays Only Sticky Posts
- Display Custom Post if custom field is marked
- Set custom field value when reaching expiration date
- Featured posts and the loop
- Jquery and Sticky
- Automatic connect wordpress to facebook with featured image?
- How to display only sticky posts on my automatically generated front page?
- How to show featured post first, then separate loop for other posts
- How to show file size of featured image? [duplicate]
- How do I change the size of the feature picture of a single post?