A few points to remember

  1. Apex is a case-insensitive language.
  2. The New, Edit, and Delete options of Apex classes are not available in the production organization.
  3. As a best practice, start class names with an uppercase letter and method names with a lowercase letter.
  4. When deploying using a change set, it runs all the tests of Apex code. If you have low code coverage, you will not be able to deploy it and it will fail every time; however, with Force.com IDE, you can push code without coverage.
  5. The blob data type represented as binary data is stored in a single object.
  6. If you want to execute code repeatedly, use do...while, while, or for loops.
  7. Rolling back transactions is also supported by Apex.

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