hubspot.com
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HubSpot is a leading CRM and inbound marketing/sales software platform that offers extensive free resources on sales strategies and inbound selling. The site features product information, a blog, guides, templates, and free courses to help improve sales and marketing performance.
More resources on Sales Strategies
The Challenger Sale
The Challenger Sale - A book resource
saleshacker.com
Sales Hacker is a leading resource for modern sales, offering practical articles, templates, webinars, and events on outbound and inbound selling, sales enablement, and revenue growth.
SPIN Selling
SPIN Selling - A book resource
salesforce.com
Salesforce.com is a leading CRM platform offering tools for sales, marketing, and customer service. The site provides product information, pricing, case studies, blogs, events, and learning resources (Trailhead) to help users enhance sales strategies and customer engagement.