I would like to edit songs and tinker with beats myself and wonder what kind of pages there are for that. I have no previous experience and prefer to try out a free app or site for the laptop
There's a lot you can do with FL Studio's Free Trail. https://www.image-line.com/fl-studio-download/
For iPhone, Macbook or Apple devices, I recommend GarageBand
I can recommend LMMS https://lmms.io/ for this. This is the most comprehensive free DAW for Windows, Mac and Linux. The following standards are supported:
ZynAddSubFX
SoundFont2
VST (i) plugins
LADSPA
CIS Patches (PatMan)
MIDI
FLP (Fruityloops Project) files
Here is the most extensive free MIDI soundfont in SoundFont2 format that can also be used in LMMS: https://de.osdn.net/projects/sfnet_androidframe/downloads/soundfonts/FluidR3_GM.sf2/ After the download, you have to copy it into the LMMS installation folder and then enter it in the settings.
In addition, I recommend installing ASIO4ALL if you are using Windows: http://www.asio4all.org/
There are numerous German tutorials for LMMS with examples on YouTube. Before you buy an expensive program, you should first try LMMS to see if you can handle it.