How do you study openings?

Do you prefer to read books, watch videos, go through grandmaster games, use computer or something else?

I mix it up.

I learn and understand the first 10 moves.

I learn and understand the pawn structure.

I play the opening.

I know...not deep or exciting, but it works.  

I study endgames by myself on a  chessboard  with a book, openings on my computer with software and database and middlegames at the local chess club. 

A database and an engine are all you need to study openings.  If an opening that I prefer has an exceptional book(one that plans out ideas and not just tons of variations that I could find in a database anyway) I'll also read through that book periodically.  Depends what openings you like and how theoretical they are.  

What engine do you use? I´m sorry if this is a dumb question, but what excactly is a database, what does it help you with and which one do you use?

I think you might want to take titled players opinions about using an engine to study openings, over that of a patzer: don't do it.

for e my first source is looking at games by Tal or Kasparov

if i want to look deeper i youtube a vid

chess clubs are good too as you get to prctice with discussion ,

database and engines are for lazy / cheats imo

The reason I would like to try out database and engines is that I don´t feel there is very many good in-depth videos on Youtube or good content anywhere else on the web. The videos here on chess.com might be something though, haven´t tried them.

What are you even talking about?  All titled players use engines in combination with databases(and their own brain) to prep for their opponents.  Obviously engine evals in the opening don't hold much water considering they rely on human book moves, but they are used to plan lines into the middlegame, where engine evals very much do matter.  Just salty because I called you out on your shithead comment earlier, eh?    

I have an older version of Houdini, it works well enough for me although there are much stronger engines out there nowadays (Komodo and Stockfish are the two strongest at the moment, if I remember correctly).  The database that I use is one that came with some ChessKing software a couple years ago, its not completely current but again it works for what I use it for.  365chess.com is probably the most popular free database that you can access.  

And a word of caution...engine evaluations in the opening are notoriously inaccurate, so don't form your repertoire based on something like "oooo my engine prefers 1.d4 to 1.e4, therefore it must be better", etc.  Just use it to guide your ideas into the middlegame, it can be very helpful to plan out a sideline or something specific when you know who your opponent is and what they like to play.  

As a class player i dont need the "latest and greatest" engine.  Not sure what im supposed to learn from a 3350 rated engine that i cant learn from a 3000 rated engine.  

Which is exactly why I have no urge to get Komodo or Stockfish.  Even the old Rybkas are good enough for any human analysis.  The only difference at those higher elos are the closed structure play...if you play the KID against an old engine you have a decent shot at outplaying it(if youre a good player, not me personally lol), whereas any engine nowadays could roll Carlsen.  

Up until fritz 13 came out, i was using the free but old version fritz 5.32

I memorize 5-10 moves then i try it in internet(live) chess for 20-30 games.

dont use engines folks , its too easy to become reliant on them use your mind , read study , i am very anti computer programmes in chess , too many use them to get inflated ratings ie cheat remove engines from chess no chance cheating can happen

Computers are a tool to learn and improve at chess, they aren't only used by cheaters, ya know.  Tell GM's to not use computers, lol.  

Using a chess engine is fine, and a great way to learn and inprove.  But what is important to remember, is to understand the "why" behind what a chess engine offers.

I use my engine in opening study when the book I use offers more than one decent alternative and I struggle to decide which one to play for whatever reason. Sometimes the type of positions that arise in the variations can make me choose one but not always. If the computer evaluation is highly favoring one over the other I tend to pick that one.

I'd like to add that when you use an opening book, which works well for me personally, play through the entire game and not just the first 15 moves or so. It'll help you with your overall feeling of the opening and you freely get some middlegame/endgame practice as the books keep annotating moves till the end.