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Have you tried Trailhead yet?
Here is the URL. https://trailhead.salesforce.com/
There are tons of modules and projects to practice on.
Hope this helps.
You would get reference from this PDF to start practice on project https://resources.docs.salesforce.com/sfdc/pdf/salesforce_creating_on_demand_apps.pdf here is the complete guide for salesforce beginners on Custom Apps, Custom Objects, Custom Fields, Validations, VisualForce Pages, Process Automation and soon.
Or you can install this App from AppExchange https://appexchange.salesforce.com/apex/listingDetail?listingId=a0N300000016aa0EAA
Thanks