My recommendations to Arch are as follows:
Avoid 'Pilze' and 'Champignons' on the menu (both words for mushroom)
If you like Italian, you'll be fine - pizza will be everywhere
Wiener Schnitzel is a good standby. I prefer Jägerschnitzel but it usually has mushrooms in the sauce so you need to watch out for that.
I would avoid Weisswurst (Weißwurst) like the plague. In fact, probably best to avoid most sausages unless they're Bratwurst as you won't know quite what you're getting.
Some things such as dumplings (Knödel) are good if you like that kind of thing but you might not appreciate them.
There will always be pork on the menu, and quite possibly steak as well (called 'Rind' or 'Rinderfleisch')
Schnitzel were traditionally veal but most are pork (if you have objections to eating veal). It may well say 'vom Schwein' in the small print which means it's pork, not veal.
Cheese and ham are ubiquitous for breakfast and lunch.
You will probably find several fish dishes available. Lachs is Salmon, Forelle is Trout and Zander is Pike-Perch (whatever that is).
Cakes and desserts will all be fab, although you're unlikely to find anything like an English pudding (spotted dick, treacle pudding, fudge pudding etc) and custard isn't really available, although they have Vanillesoß which they think is similar.
The meals may have fewer veg than you are used to, and may also seem a little dry sometimes (i.e. no gravy, particularly with a Wiener Schnitzel).
If you like meat and find a Grillteller, it's a fab selection of cooked meats but usually enormous portions. You get stuff like venison with that, and wild boar... and some mysterious sausages often too.
Kaiserschmarrn is the food of the gods.
Menus will have lots of footnotes which are to do with particular additives which have to be listed, but assuming you're OK with the usual additives you can ignore that.