Quite often there are posters in the discovery stage who need advice fast. There's a thread at the moment which is a case in point. There's loads of good advice which is being repeated by lots of posters but because the thread is moving so fast, the OP is struggling to keep up and is in a time sensitive situation. Would it be useful to have a sticky as a starting point? It could just cover the basics of what to do if you find an affair as well as stuff like feeling shame is normal (but don't) and that you're likely to be in shock. All those first day things really.
When my ex had an affair I could have done with practical advice about keeping copies of proof. Information on where to find urgent details about finances, benefits, what would happen to tenancy or mortgage etc. also some emotional hand holding type stuff.