mods, mods, mods
moddb.com is good for mods. It has mount and blade mods and mods for virtually every other game.
you can get minecraft mods and textures off the minecraft mods website.
At the ps4 "dashboard" you will scroll to the game minecraft then press the OPTIONS button or PAUSE button and then it should give an option that reads : Check for Update then click that and update it and then it should say your downloads in the NOTIFICATIONS bar. P.S I think you need a membership for playstation to access online features but I hope I was a little help at least.
The Mods was created in 1964.
you can easily get mods from planetminecraft
look what ever game you want and add the word mods to the end on google. e.g oblivion mods, GTA mods
The easiest way to explain what the mods were is to watch the film Quadrophenia 1960s Mods & Rockers film
All mods are 'legal'.
Marvel mods
That depends on what mods you're talking about.
Get all the mods!