Cialdini's 6 Principles of Persuasion
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Animated breakdown of Influence principles, highly upvoted in sales subs.
More resources on Sales Psychology
SalesHacker Psychology Section
Articles on sales psych from practitioners.
Cialdini.com
Official site with free resources on persuasion principles.
saleshacker.com
Sales Hacker is a practical resource hub for modern B2B sales, offering articles, templates, playbooks, webinars, and podcasts on prospecting, messaging, negotiation, and psychology-informed sales strategies to improve selling results.
hubspot.com
HubSpot is a leading marketing, sales, and CRM platform that also provides a vast library of free resources on inbound marketing and sales strategy. Content includes blog posts, guides, templates, webinars, and HubSpot Academy courses and certifications on topics like sales psychology, lead generation, and conversion optimization.
salesforce.com
Salesforce.com is a cloud-based CRM platform for sales, service, marketing, and analytics. The site offers product information, pricing, case studies, and learning resources (including Trailhead) with articles, webinars, and best practices on selling and customer engagement.