Find/Change feature: no spacing between words

Find/Change is not very strong at finding conjoined words — I'd say not at all but there may be some detail I've missed. That feature would need to use spell check features like word patterns and the spellcheck dictionary to guess that an odd/misspelled word might be two joined words (as spell checking already does). And, of course, joined words that make a valid third word would be bypassed and need to be caught by something more like grammar and language checking.

Short version: I don't think Find/Change or any search/replace can easily be made to find missing spaces. ETA for clarity: Spell checking, however, will find most instances of "missing spaces" and offer a one-click fix.

I don't know of a compact cheat sheet for Text Find/Change codes, but don't overlook that each field in all forms of F/C has a dropdown list of them, and using those for a while can be very self-teaching/learning. However, once you get past pretty simple searches, you will probably want to move to GREP, which can be used in a mode as simple as Text search but has almost astonishing power to pick desired words and elements out of a document. It, too, has drop-down menus, but I've attached a cheat sheet I worked up a few years back to help some colleagues come up to speed. From there, you'll want Peter Kahrel's definitive book on using GREP in InDesign.

And don't forget that ID has other search modes that are quite narrow in scope (color, glyph, object) but priceless when you need to, say, find the last instance of a color swatch that needs to be deleted.