Kon nichi wa= hello, good day in JPNese. Kon ban wa= good evening. train=kokuden.
I have been 2x in JPN, 1 on a Japan Railpass for 2 weeks, all on my own, quite some time ago now, but I even then had, if I may say from myself, considerable exp. in travel, also in countries without our ABC and barely anyone speekee the ingris/angel. Which is still very much a given fact for JPN. Where I am now in tropical surroundings are also quite a lot of young Jpnese-with blue or yellow painted hairs. I always have nice contacts with them.
Many say JP is the very safest country in this world. Also for single ladies and even more if you are gaijin=westerner, easy to see on your skin colour.
There are several forums aiming the general and ignorant unknowing traveller like you are now for there. Best known is tripadvisor-have to search a little for the forums, it is not directly visible. Have to reach it via other/more - forums - Asia - JPN. Or simply use google. READ first, most of the things any newbee wants to know have been posted+answered dozens of times.
In the past it was very evident for anyone to first borrow/buy a GUIDEBOOK, and read. Lonely Planet series is best known and some (I dk if also JPN) are even in IT translated. Perhaps there is also a library where you can borrow in your town.
DO also be very aware that JPN is VERY expensive -that means that wages for a guide are also very high-AND as far as I now know it also still has-for these pesky gaijin, many restrictive anti-covid entry rules. DO inform yourself very well. You can do it fairly lower priced-I did that too-by staying in youth hostels (become a member to them in your own country-yes, si, IT also has them), some nights in trains or bus and by buying food from the millions of small kombini=convenience stores like Lawson, Family or 7-11. JP also used to have (I dk if still the case) a kind of circle of locals willing to guide visiting gaijin in their own town, or even to visit their tiny homes, as a chance to practish english or welcome gesture. There is even a system of ´couch surfing´_where you can stay in someones house for free, perhaps just in a slepingbag on the ground, but with you also offering the same in Italia. But to arrange all that needs loads of advance planning-never do anything un-announced over there.
As for treni: just as here most treni that run are locals that cannot RES-and are extremely full in the peaks. The ShinKansen hi-speed and expresses have half RES and other half NON-in busy times that will mean you have to stand there.
