Hi, I'm new to small form factor PC's and need some good resources for beginners, I'm looking at the smallest possible machine I can make at different specs so I need some resources.
Hi! Welcome to the forums!
You really need to give us more information than that if we are to help you. What does "different [I read that as "decent, was that what was intended?] specs" entail? What will you be using it for? Gaming? Software development? Video editing? Web browsing? Media playback? Etc. - the use case decides the hardware requirements, which in turn (largely) determine the size. Beyond that, what is your budget? Do you have any style/aesthetic preferences for a case? Brand preferences for parts? Anything else worth mentioning?
The best resource possible is a personalized guide fitting your needs, which saves you about 90% of the research you'd otherwise need to do. Which is what users here can provide - but then we need to know a lot more.