For your camino
@RennieArchibald has the best and simplest suggestion: In Spain just follow the yellow arrows. They all point to Compstela, except for some which point to an eatery or accomodation off the "official " route.
All Apps have a learning period. And you have many, many suggestions above. Once started you may find map apps on your Android device become useful in other situations, such as driving to a new address and so on.
I have found anything connected to Google maps is generally not always relevant for walking routes.
On the other hand I have found the army of volunteer mappers usually ensure apps using Open Street Maps (OSM) are very up-to-date.
OFFLINE OSM apps (download maps before you leave home)
OSMAnd+
I have used this for more than four years and have got used to the "busy" presentation. A tool that may become useful (later if not straight away) is a route planning tool that can create a GPX file to save for later use and an elevation profile.
Windy Maps
This has become recently available. In my view the presentation is "clean" showing stuff for walkers (and cyclists). It has a route planning tool. I am still becoming familiar with its use.
Of these two Windy Maps might be the better for a first time user.
ONLINE OSM app (use a browser in real time)
WayMarkedTrails.org
The "hiking" option is most relevant. And it will usually show underlying changes made less than an hour before each (refreshed) look. This shows ways (or routes) and an elevation profile for a route that has been properly maintained. This link may give you some idea of what this app displays near your area:
Hiking.waymarkedtrails.org at Innsbruck
Please let me know what you ultimately decide to go with.
Kia kaha (take care, be strong, get going)