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+## Don't use $/${} on the left side of assignments.
+
+### Problematic code:
+
+```sh
+$greeting="Hello World"
+${greeting}="Hello World"
+```
+
+### Correct code:
+
+```sh
+greeting="Hello World"
+```
+
+Alternatively, if the goal was to assign to a variable whose name is in another variable (indirection), use `declare`:
+
+```sh
+name=foo
+declare "$name=hello world"
+echo "$foo"
+```
+
+Or if you actually wanted to compare the value, use a test expression:
+
+```sh
+if [ "$greeting" = "hello world" ]
+then
+  echo "Programmer, I presume?"
+fi
+```
+
+### Rationale:
+
+Unlike Perl or PHP, `$` is not used on the left-hand side of `=` when assigning to a variable.
+
+### Exceptions
+
+If you wanted to