what would you like to learn?
listening / decoding signals?
transmitting ? you will need a licence (Pete M0PSX who runs this site and essexham has a free online course to get you your foundation amateur radio license) https://www.essexham.co.uk/train/foundation-online/
if you have some basic computer skills you can buy a RTL-SDR USB dongle for your computer (its a radio receiver on a USB stick ) and some free software to start listening for a small cost https://www.amazon.co.uk/RTL-SDR-Blog-RTL2832U-Software-Defined/dp/B0129EBDS2
the link above is for the genuine dongle, there are a lot of cheap Chinese clones which are pretty shocking and basically rubbish, see https://www.rtl-sdr.com/rtl-sdr-quick-start-guide/
they have lots of tutorials on the site as well https://www.rtl-sdr.com/category/tutorial/
but once you have the dongle setup and something like SDR# installed to control it you can listen to anything pretty much
i have a post on here https://www.hamhub.uk/forums/topic/common-digital-mode-frequencies/ which gives common digital mode frequencies you may find useful as well
any questions just ask
M0PWX (not M0PSX who runs the site)