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LingakuLingaku[adjective] + 地 + [verb]
地 turns a description into a manner adverb. It goes between the description – usually a two-syllable or doubled adjective – and the verb.
The character is read de here, not dì. Same sound as 的 and 得, different job.
地 comes before the verb and says how the action is carried out. 得 comes after it and rates how it turned out.
The English is the same; the Chinese is not. 认真地写 describes the manner going in, 写得很认真 comments on the result. When the sentence is about how well something was done, 得 is the one you want.
A one-syllable adjective goes straight onto the verb with no 地: 快走, 多说, 少吃. With a doubled adjective, speech often drops it too – 慢慢说 and 慢慢地说 are both fine – while writing keeps it.
The small adverbs – 很, 都, 也, 就, 还, 已经 – never take 地. They attach straight to the verb.