I think Cherry has already gave a very good answer. Simple, but very effective. I'd like to talk a little deeper. Essentially it's about 会and 到. 今天我学会了四十个生词 As a verb, 会alone in Chinese generally means 'be capable of, be able to, can...' so, if you say学会, it means you have learned and mastered those forty words You're capable of using them properly now. 今天我学到了四十个生词 As a verb, 到alone in Chinese generally means 'arrive', so when you say 学到, it's about things that are coming to you, but you may not receive or accept them. A teacher teaches you forty new words, so you 学到 forty words. Forty words have arrived at your lovely manor, whether you'll welcome, or get to know them, or first receive them but then drive them out, is totally another thing. LOL Examples with both 学到 and 学会 in one sentence: 今天我学到了四十个生词，并且我都学会了。 今天我学到了四十个生词，但是有一些我没学会。 There are many Chinese synonyms go as the structure: AB, AC. At this time, it is the B and C that make the two synonymous words slightly different. Dig B and C a little deeper as to their most fundamental meanings, then the answer will come out.

Hello Looo, " 今天我学会了四十个生词“ It refers to having mastered the 40 new words. It emphasizes the accomplishment itself. ”今天我学到了四十个生词“ Here It refers to having finally reached the target of learning the 40 new words. It emphasizes the effort that has been done to reach this result.

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I more commonly hear 学到 meaning you successfully learned something. Perhaps 学到 is more common oral language to indicate the completion of the learning (of something). Or at least you finished learning something. 学会 means to master something, as in you didn't just learn something, but learned it so well as to master it. Please check the explanation & usage here: http://www.nciku.com/search/zh/detail/%E5%AD%A6%E4%BC%9A/47963?toolbar=1

你好，这句话你说的两种说法我个人认为都可以，另外还有一种说法，“我今天学了四十个生词。“ For 学到, I think it emphasizes the things you have learnt. 我学到了很多知识。重点是后面的“很多知识“ For 学会, it mainly emphasizes the fact that you have completed certain action. 我学会了。重点是“学会“本身这个动作。