Yes, conflicting advice must be confusing to those just setting out.
Soaking sweet pea seeds is unnecessary, as is chipping them, which will probably result in a few expletives, not to mention cut fingers.
Experience has taught me to just 'crock' pots filled with soil based compost.
Hormone powder can be useful when taking some cuttings, but not all.
Because parsley is notoriously difficult to germinate (6 to 8 weeks) I personally think it is a good idea to soak the seeds overnight in warm water before sowing, or alternatively, pour freshly boiled water along the seed drills just before sowing......others may disagree.
Beetroot is another seed that soaking aids (IMHO) germination. Before sowing I soak the seeds in water for an hour or so. This softens the seedcase & removes any chemicals present which has so far stopped them growing.