JavaScript allows variables to be uninitialized, resulting in a null or undefined value. Here's an example:

	let x;
	console.log(x);  // This will log 'undefined'

To avoid null or undefined values, always initialize your variables or check if a value is null or undefined before using it.

NaN is a special value in JavaScript that indicates an invalid number. Here's an example:

	console.log(0/0);  // This will log 'NaN'

To avoid NaN errors, make sure to check if a value is NaN before using it in calculations.

The 'this' keyword in JavaScript can be tricky to understand and can lead to unexpected scope issues. Here's an example:

	let person = {
	  name: 'John',
	  greet: function() {
	    console.log('Hello ' + this.name);
	  }
	};
	
	// This will log 'Hello undefined'
	setTimeout(person.greet, 1000);

To avoid scope issues with 'this', make sure to understand how it works and use functions such as 'bind', 'call', or 'apply' to explicitly set the value of 'this'.

JavaScript allows variables to be automatically converted from one type to another. Here's an example:

	console.log(1 + '2');  // This will log '12'

To avoid issues with implicit type coercion, make sure to explicitly convert types when needed using methods such as 'parseInt', 'parseFloat', or 'toString'.

JavaScript is designed to be asynchronous, which can lead to issues with timing and callbacks. Here's an example:

	setTimeout(function() {
	  console.log('Hello');
	}, 1000);
	console.log('World');

To avoid issues with asynchronous programming, make sure to use promises or async/await functions to handle timing and callbacks.

JavaScript objects are mutable, which means they can be changed even after being declared. Here's an example:

	let person = { name: 'John' };
	person.name = 'Jane';
	// This will log {name: 'Jane'}
	console.log(person);

To avoid issues with object mutability, consider using immutable data structures or making defensive copies of objects before modifying them.