I love every moment of it.
But... since I currently learn from Wikipedia (I'll order books soon), I've also ran into some troubles.
This also appeared in other places, when relating to cases.
I'm trying to understand what are the noun stems; the vowel stems; weak\strong vowel stems; consonant stems, etc.
The reason is.. well, take a look in this link:
http://en.wikipedia.org/wiki/Finnish_la ... noun_cases
And you'll see that nearly every case has something like this:
Characteristic ending -ssa/-ssä added to the weak vowel stem
Characteristic ending -n added usually (but not always) to plural stem
Characteristic ending: -ta/-tä, where the 't' elides if intervocalic. The consonant stem of a noun (if any) comes from the partitive singular. Otherwise the ending is added to the strong vowel stem.
So, what is this? The explanation provided at wikipedia is... not understandable.