It’s mostly chains with some links involved, especially to continue combos after specials and throws, or to insert short dashes in the middle of combos to maintain spacing. Combo difficulty varies a good bit from character to character. Generally, the way combo flow works is this:
normal -> special: Cancel
normal/special -> super: Super Cancel (costs HP)
normal -> jump: Cancel (never possible on whiff, often not possible on block)
normal -> normal: Probably a cancel (but might be a link, especially on FC. Also keep in mind that some normals will chain but not combo on standing characters since crouching means taking an extra frame of hitstun)
normal -> dash: May be a link or a cancel depending on the normal (some attacks are dash cancelable)
anything (air) -> land -> anything: Link
normal -> dash -> anything: Link
special -> dash: Link
throw -> anything: Link
special -> normal / special: Link (sometimes a rekka type chain)
super -> normal / special/super: Link
anything -> OMC or OMB -> anything: Link
Count IADs as a subset of dashes here. As example combos (links noted, cancels not)…
Here’s a Chie combo (she has rekkas):
:snka: :d:+:snkb: :qcf:+:snka: :qcf:+:snka: (link) :snkb: :snkc: :qcf:+:snkb: :qcf:+:snkb: (link) :snkc: :qcf:+:snkb: :qcf:+:snkb: :qcb:+:snkd: :qcf::qcf:+:snkd:
Here’s one of Naoto’s midscreen BnBs (the link timing after iad j.B j.C land is pretty hard):
:qcb:+:snkd: (hit, delay, link) :snkc: :uf::f: (jump cancel into IAD, link) j.:snkb: j.:snkc: (land, link) :f::f::snkc: :qcf:+:snkb:~:snkd: (link) :f:[:f:] (link) :snkc: :uf::f: (jc into IAD, link) j.:snkb: j.:snkc: (land, link) :f::f::snkc: :qcf:+:snka:~:snkd:
And here’s a Naoto SMP loop / corner combo:
:snka::snka::snkb::d:+:snkc::qcf::qcf:+:snkd: :uf::f: (link IAD, land, link) :qcb:+:snkd: (link) :d:+:snka:+:snkb: :qcf:+:snka:~:snkd: (trap hits, delay, link) :d:+[:snkc:] :snkc: :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link) :qcf:+:snkb:~:snkd: (link):qcf:+:snkb:~:snkd: