Few question about guitar playing (blues scales,soloing,writing riffs/solos, ect.)?

Will

New member
ok im sorta a beginner. not a new new new player been playin some months i know a few songs and like 1 or 2 solos. and my questions are:

1. i here alot about "The Blues Scale" like what is it for? how do u use it or how can i use it? and what is a scale? whats the point of it? i got a music sheet my guitar teacher from school gave me. "blues scale in the key of G". and i see other keys online like F & A. what are blue scales for? i also hear about the petatonic scale...help? thx u so much.

2. how do people come up with like riffs and solos? do they know how every note sounds and go form there? or is it like a formula or steps u gotta go thru? thx.
 
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