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Second part of the question is worded badly. I guess the question is “why only notes in a scale sound good when playing over progression in that scale”. The answer is that the premise is wrong. All notes can sound good in a given progression when used well. Lets simplify and not use progressions, just a single chord, for example A. A is composed of A, C# and E notes. If you play on a guitar A chord and on another guitar notes A, C# and E in whatever way they should sound “in place”, “consonant” etc. If you play for example D# (tritone) and linger on that note it will feel very out of place. Its not in the A major scale. But, if you play your A, C# and E and add just a smidge of D# there it will make your playing a lot more interesting and pleasing overall.
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