Tools an AIARE course (from any provider) will give the back-country traveler:
tools, the small scale mountain in pinckam nothc, close to the store to know the denivellation, weather forecast and avy, clothes, boots and helmet for the season, maps and compass, cairn, crampon hiking stick, ice tool, rope, pack sack, workout to be in good shape, previous experience from small to biggest situation with experience climber with leadership, etc.
all those tools most be know with a deep understanding. You most know that this jacket will keep you warm to minus 10, but it is better to have a real experience of a walk, a cross ski racing, follow by bird observation close to a house at minus 10 to know what will really keep your warm when you are wet by transpiration.
Of course, long terms learning is better than short time one. In school, kids remember ten percent of what they learned at the end of the year. So it is an Avycourses. If you don't have time, yes it is better than nothing.
But be aware: learning to follow a sign and how good is the advisory don't make you an expert to survive in winter. Always remember that an advisory is like a rating in a sleeping bag. If they said minus 18, that doesn't mean that you are not going to be freezing at night.