The first one is a Danish Gambit, which I believe to be slightly unsound. The Evans Gambit is sound I believe, but I do not use it. The KGA Fischer is all right, but Black can usually come out on top. And the last one is an interesting line of the From's Gambit. I am not in favor of Bg4 so early. I like Nf6 or g5 better. These are a good collection of gambits. Just work on them and you will be fine.