こと

About

こと can nominalize a verb or adjective, turning it into a noun.

こと can be attached directly to an い-adjective or casual form verb, but な-adjectives require な to attach.

Generally, こと and の are interchangeable as nominalizers, but there are some situations where only one or the other can be used. For more on this, see the full grammar lesson.

Summary

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  Follow an い-adjective, casual form verb or a な-adjective(+な) with こと to turn it into a noun