"vigilance" while playing

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Avatar of trek8000

hi all, I have searched but not found anything helpful.

I am new to online chess and will be starting my adventures of rated games and tournaments. 

One thing I have noticed while playing online is my "vigilance", eg, I keep missing obvious moves for and against me, tactics, that OTB I dont miss.

Are there any recommended lessons, videos, tactics etc that can help improve my vigilance in watching the whole board while playing online ?

Hope this makes sense and thanks for any suggestions.