Start with Trailhead, Salesforce's free enablement platform.
Navigate to <https://trailhead.salesforce.com/>
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There are pre-built "Trails" for specific learning paths. There are also "Trailmixes" that the community creates that combine modules, lessons, and projects from different Trails for a specific purpose.
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You can filter and search for Trails by Level, Product, and Role.
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Select a role.
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Select a Product.
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Select a Role.
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Once you find a Trail, you can select it to begin. Most Trails will have hands on projects and instruct you to create a free sandbox environment to do your Projects.
Be careful - these Projects build on each other so make sure you go in order and follow the prompts.
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Let's look at some Help documentation. This is documentation provided by Salesforce and is easily searchable.
In a new tab, navigate to <https://help.salesforce.com/s/>
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Select a Product or Search.
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Click "Salesforce Release Notes"
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If you are a Developer, there is specific documentation for you.
In a new tab, navigate to <https://developer.salesforce.com/>