Hello @TheTwister7156,
Could look at this wiki for basics:
https://wiki.flightgear.org/ATC_phraseology
Otherwise, for more advance and official (USA) see:
https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap4_section_2.html
There may be more websites for the basic that others may know of. 
To Note: The ATC in MSFS isn’t too accurate for worldwide phraseology (or even USA phraseology). But it’s a start!