Correct spelling, explanation: opened is the past simple and past participle form of open. The word derives from the adverb up, which comes from Germanic languages. Opened could already be found in Old English, but it was also affected by Dutch and German forms. Today, opened is commonly used both in spoken and written language.

Definition of opened:
1. verb (past simple and past participle) – not closed, fastened, or covered,
It was a beautiful day so the girl sat on the grass, opened a book, and started reading it.

Phrasal verbs and collocations with opened:
A few popular phrasal verbs and collocations with opened are: opened up, open an account, and open your borders.
They opened up their shop every day at 6.00 a.m. so everybody was surprised when no one appeared there yesterday.
The day he turned eighteen years old, he went to the nearest bank and opened an account.
A few days after the war started, many European countries opened their borders to the refugees.

Incorrect spelling, explanation: opened should not cause any problems when it comes to spelling as it is simply a combination of the base form open and an -ed ending, which is a suffix used to form the past and past participle form of the regular English verbs. Nevertheless, probably because of the pronunciation, some English users tend to forget about the -e letter in the -ed ending, and they misspell opened as opend.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling