Looking for valuable datasheets

[Mastaan]

I am looking for valuable and important data sheets / user guides / application notes that will teach me how to do circuit designs. If you know of any please post a link below.

Thank you.

 

[WimRFP]

Why not start with a book such as "the art of electronics".

Circuit design has several disciplines (instrumentation, LF small signal and power, RF small signal and power, general power electronics like SMPS, control circuitry, etc).