Minor key cadences are essentially the same as those in a major key. (I'll use American terminology because I think that's what I know but it may be 60 years out of date. The Roman Numerals should clarify things.)
Perfect Authentic Cadence: V-i (the "strongest ending) (V could be a V7)
Imperfect Authentic: V-i6 (the V in these cases can be a V7 or in inversion or vii06 treated as a V sans root) (anything V-i with non-root positions) (second "strongest")
Plagal: iv - i (Normally not functional but decorative, often occurs after an Authentic Cadence)
Half-Cadence: usually i-V (I think i-v may be treated this way too) could any cadence not ending on a tonic. I've seen ii06-V called a half-cadence or even II-V (major or minor) called a half-cadence or a secondary-dominant; it doesn't matter as these would be different names for the same treatment in this case.)
Deceptive Cadence: usually V7-VI (analogous to the V7-vi in major) This only differs in one tone from an Authentic Cadence and is an easy way to extend a piece; country music uses this a alot in major key.) Voice leading is smoother with the 7 than without. I've seen V7-non i or I or vi or VI but these sound different to me.
A major tonic can be used "at will" mostly. The usage I've seen (like in Greensleeves) is that the V-i is used at section ends but v-i (which isn't even a cadence supposedly) occurs internally. In a Circle of Fifths, i-iv-VII-III-VI-ii06-v-i-iv-VII-III-VI-ii06-V7-i is common; one has a 5-1 root movement but without cadential feeling (then the repeat gets an ending-like treatment). There's a version of Greensleeves in Bucholzer's book on Renaissance music that goes: i-VII-i-v, i-VII-i-V-i, III-VII-i-v, III-VII-i-V-i.
The Picard third is mostly decoration and could be used whenever it sounds good. Maybe in the Cycle of Fifths: ...v-i,...V-i,...V-i,...V-I would allow the listener to hear the section breaks.
Cadences are also used internally. Sometimes they mark important points. Some Renaissance pieces just cadence in a couple of voices and keep the motion going he the others. Country and Latin (and maybe pop and jazz but I'm less familiar) will cadence with the drums still going and the bass walking between keys to make a smooth key change.)