Here I will teach you about Illustrator-technique-star-wallpaper
Lets read & understand of the following step

[1]-First of all click on file > new

[2]-Open new document size:custom ,width : 612pt,height:792pt units : point and click on ok

[3]-Now Click on The Rectangle Tool in the Tool Palette and Draw a Shape Like This With the Help of Rectangle Tool

[4]-Now Click The Gradient tool in The Tool Palette And Make a Gradient Like This And Fill In The In The Rectangle

[5]-Now After Applying Gradient Your Figure Should Be Like This

[6]-Now Create A Star Like This With The Help Of Star Tool

[7]-Now Select the Object Click On The EFFECT> 3D> EXTUDE AND BEVEL You Will see (3d EXTUDE AND BEVEL) Window Is Open
Use The Following Setting

[8]-Now Your Image Should Be Like This

[9]-Now Again Select the Object Click On The EFFECT> 3D> EXTUDE AND BEVEL You Will see (3d EXTUDE AND BEVEL) Window Is Open
Use The Following Setting

[10]-Now Your Image Should Be Like This

[11]-Now Again Select the Object Click On The EFFECT> 3D> EXTUDE AND BEVEL You Will see (3d EXTUDE AND BEVEL) Window Is Open
Use The Following Setting

[12]-Now Your Image Should Be Like This

[13]-Now Select the Image Click On The Object > Expand Appearance

[14]-Now Your Image Should Be Like This

[15]-Now Click The Gradient tool in The Tool Palette And Make a Gradient Like This And Fill In The In The Star

[16]-Now Your Image Should Be Like This

[17]-Now Again Create A Star Like This With The Help Of Star Tool And Now Click On The Object > Path > Offset Path

[18]-Now You Will See Offset Path Window Is Open And use The Following Setting

[19]-Now Your Image Should Be Like This

[20]-Now Select The Inner Star Change the Color

[21]-Now Your Image Should Be Like This Now Again And Again Create A Multiple Copies of Star With The Help Of(ctrl+C)And (ctrl+v) And Fill A Different Types Gradient

[22]-After You Creating A Multiple Copies of Star Now Your Final Image is Ready
Thanks for read this Illustrator-technique-star-wallpaper.I hope you have enjoyed &
the Final Output of this Tutorial is shown below.

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