& seperates commands on a line.

&& executes this command only if previous command's errorlevel is 0.

|| (not used above) executes this command only if previous command's errorlevel is NOT 0

> output to a file

>> append output to a file

< input from a file

| output of one command into the input of another command

^ escapes any of the above, including itself, if needed to be passed to a program

" parameters with spaces must be enclosed in quotes

+ used with copy to concatinate files. E.G. copy file1+file2 newfile

, used with copy to indicate missing parameters. This updates the files modified date. E.G. copy /b file1,,

%variablename% a inbuilt or user set environmental variable

!variablename! a user set environmental variable expanded at execution time, turned with SelLocal EnableDelayedExpansion command

%<number> (%1) the nth command line parameter passed to a batch file. %0 is the batchfile's name.

%* (%*) the entire command line.

%<a letter> or %%<a letter> (%A or %%A) the variable in a for loop. Single % sign at command prompt and double % sign in a batch file.