Stroke order
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation 
Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
How it used to be written
打
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Small seal script
开
These are the forms of 開, the traditional character: 开 is a twentieth-century simplification, found in no ancient corpus.
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Warring States script 戰國.秦 -
Clerical script 東漢 - See all 7 forms
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).
Examples
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不要打开你的书。
Don't open your book.
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你为什么把灯打开了呀？
Why did you turn on the light?
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你用什么打开的？
What did you open it with?
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她太过好奇，以至于打开了盒子。
She was so curious that she opened the box.
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当我打开门的时候，我发现他睡着了。
When I opened the door, I found him asleep.
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我不想打开窗户。
I don't want to open the window.
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我们来打开窗子吧。
Let's open the window.
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我刚打开锅盖，一股恶臭就扑鼻而来。
I just opened the lid, and a foul smell filled my nose.