useful websites

www.google.com

Google provides a built in dictionary tool that searches through various dictionaries at once. You can open this tool i.e. dictionary by simply typing "define:temple". The results will show numerous definations in different contexts. www.dictionary.com
Dictionary.com is a full-fleged dictionary that's much more powerful than Google's. You can download & install the dictionary.com toolbar for easier access to it.
Apart from the usual meaning of a word, it also shows alternative meanings sourced from other dictionaries, word origin,pronouncitation guide, and the usage of the word( as noun, adjective, plural, etc।). And don't woory about spellings,dictionary.com suggests alternatives to misspelled words.
www.m-w.com-Merriam-Webster's dictionary

The good thing about online dictionaries is that if you don't get something from one dictionary, you can get it from another। So if you can't find what you are looking for on dictionary।com, try out American-Webster(www।m-w।com) ।Here you can use wildcards when you are not sure about a word, and search for plurals, tenses, and verbs। You can listen to how a word should be pronounced, for free & also download the files in .war form to hear them at leisure.

www.webpedia.com

Most dictionaries fall short when it comes to defining words that are too specific to a category-for instance, technology. That's where webpedia fills in the gap-and admirably. The definations are concise , and any tech-terms occuring within the definations are hyper-linked, so that you can look up whatever you don't understand.

www.bbc.co.uk/learning/courses/index.shtml
This is one place that offers its courses for free. You will find basic computer skills ,gardening,histroy,& journalism. Also visit thelanguage section. The arrangement of topics is interesting.
www.egurucool.com
This website offers online maths & science tutorials for CBSE,ICSE & IIT-JEE. You need to buy the courses. The 'course catalogue' runs you through the varied tutorials along with their price. Once the quote is bought, just follow the steps given to activate it & you are all set to go. www.netvarsity.com
This site provides a range of courses in IT, Soft skills & project management from the cost-effective go day 'silver' subscription to the value added six-month 'platinum' subscription. The courses train you in leadership skills, prepare you fot IT-certified courses, etc.