With the Relative Posts plugin widget you can show up on the sidebar a list of related articles with or without thumbnails very easy.
More Plugins
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Simple PayPal Recurring Donations
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Simple Export to Markdown
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Combine Galleries
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About the Author Advanced
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Custom Option Page for ACF
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PostViews Count & Popular Posts Widgets
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AffiliateWP – Affiliate Area Tabs
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Space Boxes
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Marquee Block
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Integration with HubSpot for WooCommerce
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Carbon Copy
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ToolTips For Contact Form 7
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MultiSite System Cron
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Block Diffusion – Generate images from text prompts
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WP Hooks Finder
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Pingo Notify – Automation & Notification Chat Messages
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MyADManager
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EasyMe Connect
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Social Meta by Brozzme
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Visual User Description Editor