how would one optimize his c# scripts to run as fast as possible … and what are some great performances optimization tutorial when it comes to unity in general
That is probably the most open question there could be! As such there is no answer.
Its like asking, how do I make a game? There is no one right answer, there is no definitive and only way to do so. Same for optimising. Once you have made your functions and opened the profiler for each problem, then you can start asking the real questions like how do I improve my existing save code, or rendering time or whatever.
Optimising can be the death of your project if your not careful, get it made first then worry about it later 
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Here are a few links that you can study…
Unite Europe 2017 - Practical guide to profiling tools in Unity
Unite Europe 2017 - Performance optimization for beginners
Unite 2017 Seoul - Tips and Tricks for Optimising Unity UI
Unite Europe 2016 - Optimizing Mobile Applications
Unite 2016 - Let’s Talk (Content) Optimization
Performance Optimization
Practical guide to optimization for mobiles
https://docs.unity3d.com/Manual/MobileOptimizationPracticalGuide.html
Unite Korea 2013 - Memory Profiling in Unity
Optimizing graphics performance
Optimizing Unity UI
https://unity3d.com/de/learn/tutorials/topics/best-practices
Spotlight Team Best Practices: Optimizing the Hierarchy
10000 Update() calls
ParticleSystem Performance – Culling
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thank you so much … you’re a life saver
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