While I do try (at least from now on) to include actual explanations where needed in my edit summaries, this is not always necessary, and I will, where possible, choose from these simple abbreviated summaries.

This list may not be complete

General

[edit]
tyop
Correcting own typo
rvv
Reverting blatant vandalism
rself
Reverting self
fix
Minor corrections (existing typos or spelling errors)
fix dab
Changing links to disambiguation pages to point at their intended targets

General, discussions only

[edit]
expand
Adding content inline with my own comment
ps
Adding content after my own comment
r
Reply to someone else's comment
sign
Correcting own lack of signature

In deletion debates

[edit]
del
delete
keep
keep
sd
speedy delete
sk
speedy keep
merge
merge
redir
redirect (retarget in RFD, may be more complex in TFD)
o&r
Overturn and relist (DRV)
o&k
Overturn and undelete/keep (DRV)
sr
Speedy relist (DRV)
userfy
Userfy (TFD)