Best way to avoid blundering ?

Hi everyone, I'm a quite new chess player, and I learn to play alone (in fact, I only play in lichess).
My main problem at the moment is blundering, as it's the reason of like 90% of my losses. Very often, I think I play relatively solid for a beginner but I also end up with terrible blunders which make all my efforts useless. Like in those games :
http://fr.lichess.org/mcS5qWGx/black#35
http://fr.lichess.org/ItXfyW3t/black#40

And then, I played another game with this game and won easily. It just shows how terrible my blunders are :
http://fr.lichess.org/FIAoebYX#1

I feel really stupid when I see that because these two examples were incredibly easy to see and to avoid.
So my question is : have you got any tips to avoid blunders ? Maybe good players have a particular way to look at the board, or maybe they ask themselves the good questions to avoid blunders. Maybe it's a stupid question but any advice would be welcome !

Best way to avoid blundering?

... don't do it!

Oh and use the Grob opening.

Best advice I can give is scan the board before and after every move. Ask yourself "are any pieces not protected by another piece?" then ask yourself before you commit to a move "does this move leave any pieces unprotected?" Also after your opponent's moves ask yourself "what pieces does this threaten?" and if one of those pieces is defending another piece that is being attacked, you need to react to that, or you are going to lose a piece.

When you become more advanced, you'll start asking yourself "what is this move threatening to do" for both your opponent's moves, as well as yours when developing a plan. You'll start looking more than one move ahead, but blunders at the beginning level are generally a result of not even seeing the simple fact that you are hanging a piece, so this sort of quick double checking both before and after moves will remove probably 50% or more of your blunders.

It´s a matter of practise in our level. You will be remembering patterns in your head (x rays, discover attacks, double checks, deviations, etc.), so this will be much more natural. But as static said, the thinking process should be after EACH opponent move "what is he doing, is he attacking anything? If so, then do something about it, if don´t, then try to play your ideas or plans whith the same principle "if I go there, will be my piece hanging or any other piece? Also a useful way to avoid blunders is "what is this piece doing? If I move it, then it won´t be defending that square, so this means that... whatever. Also, play 5+3 or 10 min games, is much more likely that you won´t blunder if you have some time to see the position.

Solid and awkward at the same time ? Lack reading . The fumble may have moments of strength but the solid no time moments of fumbling.

I recommend you doing puzzles with focus on board awareness, even though lichess is really superb site with a lot of puzzles, I also recommend you for puzzles only chesscademy.com At least it helped me quite a lot. Next advice, play classical games, where you have enough time to think through the position, decide which square you want to attack, and before doing any move ask yourself what does that do and how can respond your opponent. As you will get better, you will be able to imagine your opponents respond several moves forward. So sometimes it might look like a good move, but in a few moves you may find out that it was actually blunder.

Ok thanks a lot for the answers, I guess I will just have to practice by thinking a bit differently now.

ChavezH : I don't see how the grob opening will help me ?
Static_Shadow and Spab you are completely right, I think I sometimes focus too much on what I am planning to do and forget that my opponent is a threat. I will ask myself these questions after each move and see how it goes :)
Robson_Santiago : Yes the word "solid" was probably not the most adapted lol. I just meant to say that I was I able to dominate some opponents and then giving him my queen for no reason !
Einsamkeit : I like doing puzzles and I really appreciate the one on chesscademy because they give you explanations ! I saw that there is a course about board awareness so I think this site will help me a lot, thank you for making me discover it !

Also if you want, you can challenge me and we can discuss some moves during the gameplay, or positions, what was better to do and why.

A couple of things should help a lot.

1) Longer time control games. When you are trying to improve, you need time to work on your mental process. You can't work on something you are being forced to do almost on instinct. It will be much easier to tidy up your process if you play longer games. By longer games, I mean >30 minutes per side.
2) Consistent process. Once you've decided on a move, right before making it, take a few seconds and do a sanity check. Ask yourself "ok, what devastating reply does my opponent have?" or something similar. If they are easy to see and you aren't seeing them, then you aren't looking for them. Give yourself the opportunity to do so and do it consistently.
3) Practice super easy tactics. Concentrate on hanging pieces and simple double attacks until you see them instantly. You can do this at http://chess.emrald.net by setting your level to something really low. The more of these you do, the faster you'll get at seeing them. The point is when you do give yourself time to "blunder-check," you'll will be better at seeing them very quickly, easily, and consistently.

Good luck.