Warning: Research all payware for MSFS before making a purchase, just because it is offered in the MSFS Marketplace does not make it of higher quality than freeware. While you may find it still suits your purposes, many people have lost there money and resorted to complaining on forums about the poor quality in some of the aircraft because they couldn’t wait for a reputable company to produce and release it. An example being aicraft which uses the cokcpit from other aircraft, which means you are essentially just buying the skin.
YouTube is a great place to look for reviews!

Microsoft Flight Simulator 2020 (MSFS2020)
The official website, the best place for development updates and release information.
www.flightsimulator.com

FlightSim.to
Your best resource for free MSFS mods, from livery’s to scenery and aircraft.
The best part about FlightSim.to is you can track what you have previously downloaded and see if any new versions are available.
www.flightsim.to

Orbx
Orbx started out in creating some of the best scenery for previous versions of Microsoft Flight Simulator, and they still do but it is also a central hub for payware including aircraft from many companies, such as Aerosoft, Airplane Heaven, IndiaFoxtEcho, Simworks, Iris, Milviz, Big Radials and more.
Its often recommended to get your payware from sources other than the MSFS marketplace for various reasons, so downlaod there app OrbX Central, which makes keeping your payware upto date.
Orbx also features a good list of freeware – check it out.
www.orbxdirect.com

PMDG Simulations
Nobody can match the quality of PMDG’s near study level aircraft, such as the Douglas DC-6 and all Boeing Heavies such as the 737 & 747 which are soon to come.
Updates from PMDG on aircraft previews and release dates is the most anticipated news in the flight sim community.
Buy direct from there website, to get the aircraft faster as well as the additional software which comes with it, being the PMDG Operations Center, which makes keeping it upto date and adding liveries a breeze.
www.pmdg.com

YouTube
Not sure if flight simulator is for you or just wish to pass some time?
Watch in-game videos and reviews of the most popular flight simulators.
www.YouTube.com – Flight Simulator