One of the largest sequence breaks in OoT is obtaining the Master Sword without opening the Door of Time. This allows the player to reach Adult Link without obtaining the three Spiritual Stones or the Song of Time. This technique is used in all categories but Any% and Glitchless, and the methods differ between routes. Most N64 routes do Swordless DoT Skip, while VC typically does it with the sword.
OneMakaron discovered easy setups for the angle that work for both sword and swordless DoT skip
Perform a setup for the angle needed for the clip and then keep holding target. If you used either of the setups shown, you can simply roll with ESS down, but if you release target you'll have to move the stick toward down left to get the down left roll, unless you set up again. To do this, tilt the control stick down and slightly to the left causing Link to perform a sideroll towards the left when A is pressed. If the A button says Jump, you are holding the stick too much.
To elaborate: in the past, before any setups were found, the angle was found with C-up, and you always had to hold down leftish to get the sideroll. However, if you use one of the setups, you can simply hold ess down to get an easy down left sideroll. If you were to release target by mistake, you will lose the stored down left sideroll and have to sideroll with down left, unless you set up the trick again.
If you are new to the trick, it might be a good idea to practice the sideroll when Link is not in the corner, since depending on the stick position, there are many ways Link can sideroll, and only one gives the right kind of sidehop needed to clip through the corner. What you are looking for is a sideroll where Link does not move forward during the sideroll.
To actually clip, you need to perform the sideroll and during it, hold downright on the control stick and once the sideroll is almost finished (just at the end of Link's roll cry), press A to perform a backwards sidehop (the right kind of sideroll is needed to achieve this kind of sidehop). The frame window for the sidehop is small (1 frame) but can be timed with some practice, or hit by mashing A, although it is not as reliable as timing.
If you practice the sideroll outside of the corner, you can try doing the sidehop as well. What you are looking for is a sidehop that launches Link almost directly backwards, instead of to the side like usual.
Once you are able to perform the sideroll and sidehop, all that is left is to jumpslash back inbounds. It is recommended that you switch to holding straight left after sidehopping to guarantee Link gains enough sideways movement to clip inside the Door, instead of recoiling off the side or clipping back inbounds on the side you sidehopped from.
There are 2 frames for the jumpslash back inbounds. After the sidehop, keep holding target and switch the control stick to straight left as mentioned above.
The first frame you can jumpslash on is the first one Link can no longer be seen on the screen, on this frame, keep holding left and during the unpause lag of the pause menu, press or mash B to jumpslash inside the Door.
The second frame is when Link can't be seen on the screen, but you can hear him gasp as you pause the game or advance a frame. This frame can be recognized from visual differences as well compared to the first frame, but using the audio cue is easier as the visual changes are only slight. On the second frame, instead of holding left, switch the control stick to straight up and once again buffer or mash B during unpause lag to make Link clip inside the Door. Once back inbounds and inside the door, you can simply sidehop or otherwise make your way to the Master Sword.
DoT skip can also be done unbuffered, but it is recommended atleast to new players to pause for the jumpslash, as it doubles the framewindow you have for it.
For new players, it is recommended to if not master, atleast become somewhat consistent at clipping with the sidehop before worrying about the jumpslash. The clip itself is the difficult part as the sideroll can be hard to achieve and the sidehop timing can be tricky at first. Once you have the clip part down, getting back inbounds is easy in comparison.
RunnerGuy2489 created an in depth tutorial for Door of Time skip. Many new players consider this the best tutorial for this sequence break. However, this video gets the angle for the skip with C-up. It is recommended that beginners use the Makaron's setup(s), as they are more consistent.
The most updated Door of Time Skip tutorial is by Aliensqueakytoy, and covers both sword and swordless Dot Skip, and all of the angle setups.
Note: The angle shown in the Makaron video at the top of the page also works for swordless DoT skip.
In some circumstances it is necessary to skip the Door of Time without a sword, generally in N64 routes. It is recommended that you use one of the above setups to get the angle, as it's more precise than standard DoT Skip. You can at times clip without retargetting the door, so it's recommended you use one of Makaron's setups.
The next part is clipping out of bounds. This is done the same way as normal — sideroll, and then sidehop. Before you fall out of bounds, make sure you release Z and the control stick. The timing for the next part is similar to the above method. Press Z on the same frame you would jumpslash on (first frame where you can't see Link), this frame looks different that during DoT skip with sword and the camera will be facing downwards. Too early or late and you'll end up falling oob. When you hear Link do a jump hold left and you should be through, this happens few frames after the target frame. If you are pause buffering, hold left on the frame where you can see Link's hair. The amount of time you have to press left and still make it through is pretty lenient, but if you press left and Z too close together, Link will be crushed by the door.
There are 4 ways to skip the Door of Time as Adult Link:
Giant's Knife clip (also works with Biggoron's Sword). This is not very common due to requiring the GK or BGS, but is the easiest and quickest. It also requires Hover Boots.
Recoil boost. This is the most common method, and requires the Master Sword, a shield and Hover Boots
RBA Odd Potion for the Song of Time (note: for the song to work, you need to enter the Temple of Time from outside. Simply warping in with Prelude of Light won't work). This method is useful mainly only for bingos or puzzle goals.
Void warp with Farore's Wind or with the Prelude of Light.
This method requires either the Biggoron's Sword or the Giant's Knife as well as the Hover Boots. Look at the crack where you would normally do DoT skip. Aim at it at a 45-degree angle and use a triple thrust with your sword (Z + Up + B to stab forwards). You will clip on the third thrust, assuming the angle is correct. As soon as you clip, sidehop to the right to land back inbounds on the other side of the Door of Time.
To get out of the room as adult you need to either savewarp or use a crouch stab recoil boost from inside a pillar which requires early Hover Boots.