(colloquial, vulgar, humorous) It is fruitless to speculate about counterfactual situations.

It is better to do something oneself than to rely on others to do it well.

Please, kindly; used in giving a non-concrete instruction. / So to speak, like; used to indicate that a description is not standard. / Used in conceding a description.

Used to introduce one's opinion about something to which offence could be taken

Used to introduce one's opinion, without being asked for it.

Many problems are happening simultaneously or in close succession.

(informal, usually humorous) Used as a reply to see you, see you later, see you soon etc., implying that if the speaker sees the interlocutor first then the speaker will avoid the interlocutor.

If I have correctly remembered the details.

(idiomatic) To an excessive degree, oftentimes with little to no regard to future consequences; desperately; recklessly or wantonly; frantically; very quickly or very much.

Nonstandard form of if.