Another great learning path you can take is 1941, 1942, and finally 1940. More complicated/bigger usually equals more fun and more time-consuming.
Anniversary is still the most popular among loyal but infrequent gamers.
the website/shop “Field Marshal Games is not working”
please help i would like to purchase something from there
@king_of_tanks not sure there current status. This thread may be helpful
https://www.axisandallies.org/forums/topic/27902/issues-with-field-marshal-games?page=1