As mentioned Wes Bos has great in-depth courses on front-end stuff, also Tyler McGinnis. Frontendmasters.com is far and away the best site for front-end tutorials out there.
I tried out frontendmasters and really liked the format. Some of Kyle Simpsons stuff was great. Currently persuading employer to pay the annual fee for me. Although the courses are latest popular JS frameworks which although i'm kean to dabble. Aren't my employers first choice for paid training.