We have been traveling at least twice per year internationally but never bothered to sign Frequency Flight program. Now I saw "star alliance membership" like to sign (up coming trip-Lufthanza flights) but it looks very complicate... I even checked flyertalk/star alliance website but still no clue.
1. Do we have to obtain miles/points per year in order to maintain the membership?
2. Can I fly any star alliance member flight and accumulate mile/point?