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It's good to remember that you're on something that once was mostly a very Catholic pilgrimage route for those venerating a particular Catholic saint. But with its 300,000+ pilgrims in 2018, of which only 1/3 were there for mostly "religious" reasons, something has obviously changed.
Some...
One more thought: Whatever method you choose, hold it lightly. Nobody says you have to do Duolingo, or Babbel, or...., or..., or.... for the rest of your life. Different programs and approaches will serve you best at different stages of your life and language learning. My personal...
The quality of Duolingo varies widely, depending on the language. (For example, Chinese is excellent, Vietnamese hopeless, Italian random...) I have not looked into Spanish, but my experience has been with Italian. Basically you get lots of random phrases and it will be difficult to put those...
As you consider various options, look at temperature and humidity, too. Walking in the sun at 35°C with 20% humidity is very different from walking on a grey British isles day. As much as possible, train in the same climate as you plan to walk.
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