jQuery

Selectors:
    $("*")	Selects all elements	
    $(this)	Selects the current HTML element	
    $("p.intro")	Selects all <p> elements with class="intro"	
    $("p:first")	Selects the first <p> element	
    $("ul li:first")	Selects the first <li> element of the first <ul>	
    $("ul li:first-child")	Selects the first <li> element of every <ul>	
    $("[href]")	Selects all elements with an href attribute	
    $("a[target='_blank']")	Selects all <a> elements with a target attribute value equal to "_blank"	
    $("a[target!='_blank']")	Selects all <a> elements with a target attribute value NOT equal to "_blank"	
    $(":button")	Selects all <button> elements and <input> elements of type="button"	
    $("tr:even")	Selects all even <tr> elements	
    $("tr:odd")	Selects all odd <tr> elements

Events: 
    Mouse Events	Keyboard Events	    Form Events	Document/Window Events
    ========================================================================
    click	        keypress	        submit	    load
    dblclick	    keydown	            change	    resize
    mouseenter	    keyup	            focus	    scroll
    mouseleave	 	                    blur	    unload