Techniques

This is where I'll post all the techniques I use.

Folding and creasing properly:
This is the most fundamental part of origami. Folding paper seems like common sense, but I'll show you somethings to look for.

This is NOT the way to line up corners.

Closer, but still needs to get more precise.

It's a hair off, but it could be closer.

There we go! When you line up corners, make sure NO white is showing. Even though your sides might be off, at least two of your corners look good.

This is me doing a light crease.

This is the result of that light crease. It's still kinda "puffy" so I'll show you how to make it nearly flat.

The trick is to use your thumb nail. It can be any nail, but the thumb is  easier at this moment. This is how you make a "crisp" crease.

I'm creasing it halfway for now.

I'm trying to show you the difference between the crisp crease and that light crease. You can kinda see that the crisp crease is much nicer than the light crease.

This is the result of doing a crisp crease. Notice how much flatter and nicer it looks.

This creasing skill is useful for every single origami piece. Especially when you need to mark a line for another fold or something like that. Also, when you finish a piece, if you crease all the folds then it looks neat and pretty. 

Ripping:
There are different ways of ripping paper. I'll show you the way my sister taught me that only requires two hands and some flat surface.

Step 1: Crease the paper one way as well as possible

Step 2: Fold the same crease the other way. Repeat the foldings until you think the crease is weak enough to rip (I usually  crease it 4 times at least).

Step 3: Position the paper like how I have it. If you have the paper bending up towards you, it makes the ripping easier.

Step 4: Start the ripping process by making a simple initial rip at the top of the paper.

Step 5a: Now start ripping the paper by pulling it apart with your hands. Don't move your hands from the paper, but twist your wrists so they make a V like shape.

Step 5b: Continue ripping until finished

WARNING: This will happen if you don't crease it enough! Also it could happen if you rip it wrong.

Step 6: Ripping is complete.

Yes, I did rip the paper by accident haha. I decided to make the best of it so I took a picture of the rip I created. I just decided to finish ripping the paper so that's why the result in Step 6 looks like it does.

You could also rip on a table edge, but I personally don't like to do it this way very often. 

How to make a piece of paper into a square:
Most origami is made with square pieces of paper. Use this fundamental technique when you're in need of a square piece.

Step 1: start off with a piece of paper

Step 2: take a corner and make it parallel with the other side.

Step 3: This is the ending result. It should look like a triangle

Step 4: Flip it over

Step 5: Take the part that's not with the triangle and fold it along the edge of the triangle

Step 6: It should look something like this. The edge of the triangle and bottom area should be as parallel as possible

Step 7: Fold that area back and forth until you think it's easy enough to rip.

Step 8: This is how your paper should look like all unfolded with the creases.

Step 9: Start ripping the bottom area off. It'll be easier if the paper fold is bent up like shown in the picture.

Step 10a: Rip all the way down as clean as possible.

Step 10b: This part always gets me. I like to have the paper unfolded like this because whenever I leave it folded like a triangle, I tend to rip a corner off of the triangle. You don't have to unfold it like I do.

Step 11: Done! Now you have a square piece of paper and an extra strip for whatever you want to do with it. Make more squares, paper footballs, stems, etc.

How to make a flower stem:
My sister taught me how to make a flower stem, so I'll pass it onto you! I guess you could make a stem out of any size of paper, but I usually make them from the excess after making a square piece of paper.

NOTE: Steps 3 and on are a bit confusing to show through pictures and words, but I'll try to do my best to make them as clear as possible. If not, post a comment below and give me suggestions on how I should do it (that does NOT require making a video).

This is from after making your square piece of paper. I like using the excess for the stem.

Step 1: Take that excess piece and paper and position horizontally in front of you.

Step 2: I usually start from this corner that I'm pointing at (especially since I'm right-handed) since it's not from the ripped part of the paper, but any corner will work.

Step 3a: Bend the corner just a little bit like so.

Step 3b: Once you've bended the corner, roll it up a little bit like in the picture, but do NOT flatten the roll!

Step 3c: This is the result of rolling the paper a little.

Step 4: Okay, this is where things start getting a bit tricky. Do your best to roll as THIN as possible withOUT flattening the paper. The steps leading up to this one should make it pretty easy to have a nice tight roll.

Step 5a: Continue the roll. As you can see I'm using three fingers to roll the paper. I usually do this just so it rolls evenly and I have proper control over it.

Step 5b: Keep rolling it. Note the angle of my roll. Depending on your angle, your stem will be long or short. I try to roll it greater than a 45 degree angle (not specific angle though) because I like that kind of length.

Step 6: This is the result. It should look nice and tight, not nice and large. For average computer paper like this, The stem should be thinner than a No. 2 pencil so it'll fit in the lily.
REMEMBER: Do NOT flatten AT ALL or else you'll ruin it.

Step 7a: Hold the stem so the open part of the top is facing you.

Step 7b: NOW you can flatten! However, only flatten as much as I have, so a little over a centimeter. This is so you can do the following steps.

Step 7c: This is the result after you flatten and fold it down. Note how the rest of the stem is still round.

Step 7d: Keep folding until your desired length or it becomes too hard to keep going (I've done that before).  The purpose of this is so the stem won't unravel and pass through the lily when inserted (you'll see what I mean in the "Lily" post).

Step 7e: This is the result. Your stem should be like mine and NOT unravel. Note that nothing is helping the stem stay like this.

You're done! Now that you have the stem, you can insert it into the Lily. Go here "Lily" to see how to do it.