Useful links
A list of satellites indicating the operating frequency and modulation
This list will be useful when receiving beacons and telegraphic signals (Morse code).
Amateur radio blog R4UAB
The blog contains a large amount of up-to-date information on receiving satellite signals and launching new satellites.
DK3WN Amateur Radio blog
The blog contains a large amount of up-to-date information on satellite signal reception and satellite status.
SatNOGS network
is a global network of private radio stations for receiving satellite signals. The site has a database of satellites and examples of received signals.
Website about software-defined radio RTL-SDR
A large amount of information about various aspects of the application of software-defined radio. There is a section on receiving satellite signals.