"Well, the most dramatic is that I can call down lightning, for example if someone is attacked by bandits, or cause earthquakes, though situations where I might even consider that are vanishingly rare - I've done it maybe twice in the last thousand years. Even calling lightning is much less common than anything else I do - for most people I'll give advice about routes or destinations or supplies or any other questions they might have, or give them supplies from the things that other people have given me as offerings, or send someone to travel with them if they'll have trouble doing it themselves, or give them a blessing if they ask, or if they seem like they have need of one - the blessings I have to offer are improved direction sense, improved weather sense, improved endurance, improved memory, poison resistance, and improved recognition of human body language. Occasionally someone will ask for something else, and if it'll help them in their journey and not hurt anyone else I'll do it if I can, but most gods have fairly similar ways of doing things, where I'm from, and people know how we work and mostly ask us for the same sorts of things.
For what I ask, most of the region I'm in has a tradition of giving gods offerings, with an explanation of how they make sense as offerings to that god in particular, and that works fine - it's not the only way to do it but I think you might find it the most agreeable, since it's discrete and individual. The important part is paying me a bit of attention, and some other places do that in other ways - holidays dedicated to gods are also fairly common, for example. In particular I like practical offerings, because it's easier to pass them along to travelers who need things than to make new things myself, so I encourage people to give me any traveling supplies that are still in good condition at the end of their journey, if they don't think they'll want them again, and I also like travel journals and travelogues."