Beginner

[Da1m0n]

These patches are meant for ripped games released by groups such as Echelon, Kalisto, Hooligans and others. Unless you downloaded one such game and have the image on your harddisk, the patches/trainers will be useless to you. (Sometimes you can copy a burned game CD back to the harddisk and patch it, but it requires extra work to create and burn a new selfboot image.)
PPF files are the actual patches; NFO and DIZ files are plain text files you can open in Notepad. They're meant for you to read.