New to Salesforce? Here is how you can sign up for a free developer edition of Salesforce and get started in just a few minutes. What is nice about this free Developer Edition is that it contains almost all the features and functionalities that Salesforce offers. It won’t have everything, but should have about 80 to 90% of the features by my guess.
However, there is one major limitation that you need to be aware of. Note that the free developer edition comes with just 5 MB of data storage and 20 MB of file storage. In Salesforce one record takes about two KB of space. So going by this calculation, you won’t be able to store more than 2500 records in the Org.