Part ONE

Forgetting or not understanding the differences between (···) {···} [···]

(···)  parenthesis are for logical grouping and are useful when you are unsure which operations take precedence    

Three Examples of common mistakes:

{···}  curlies are for lists, iterators, and variable bounds

Example of a common mistake:

[···]  single brackets are for lists, iterators, and variable bounds
        Common Mistakes:

Examples of common mistakes:

[[···]]  double brackets are for lists, iterators, and variable bounds

Example of common mistake:

Forgetting Mathematica's convention of capitalization of Functions

Examples of common mistakes:

Forgetting to use patterns in function definitions

Examples of common mistakes:

Forgetting to delayed evaluation, :=, in function definitions when the placeholders have been previously defined.

Example of common mistake:

Created by Wolfram Mathematica 6.0  (27 August 2007)