Based on what I have read on this site and heard from a rav, the majority of what most people currently do during burial is minhag rather than halacha.
Is there a written or online compilation of halachot and minhagim (Ashkenaz, Sephardi, or others) explaining both the procedures as well as the reasons for what is commonly done during burial. Among the things I've seen:
- Carrying the coffin a few feet while reciting something (I don't know what); stopping, and repeating this process several times until they reach the grave.
- Positioning the coffin so that the head faces a certain direction
- How much must be manually shovelled and what can be done by machine?
There are likely many other rules and customs in addition to the above. I'd like to find a single source that explains most or all of these.
Note / Update
I pretty much know the main rules of mourning and burial. I am specifically interested in sources that explain the reasons for various items done at burial, not merely a list of what to do. Per, @DoubleAa's suggestion, please specify which sections of your source explains what is done during just the burial, not the rest of mourning period. If the source does not provide any reason for anything, then this is not what I am seeking.