Much agreed, all these native Finnish terms are very confusing without proper explanations. I would honestly much rather learn more generally useful phrases or different verbs that I can use in a variety of situations. The examples in this lesson are very nieche.
For "haluan", I know the colloquial form "haluun". Is it the same with other forms of the verb, like, would I say "Haluutko mämmiä?" in colloquial speech, so the colloquial infinitive form would be "haluua"?