There are some really nice shots in those groups, and a few not so great. Other, more qualified voices have already given constructive criticism here and the only thing I can add is that I generally can't stand posed pictures but love shots where people are doing something and are not really aware of the camera. Especially at something like a wedding and reception; so much is going on in terms of animated conversations, people laughing together at happy/funny stories, children having fun, etc...
I love photography even though I've never studied it formally, my own picture-taking has improved markedly since the advent of digital photography since one can now snap away like crazy and then cherry-pick the best shots, studying them for what is good about them. Keep it up, man! You have a good attitude about starting somewhere and an open mind, those things are indispensable to getting good at a craft.
