Shygirl.
Crofting - simple overview follows.
Owner Occupied croft is, as it says, a croft (agri land but often can be rough grazing mostly) that is owned outright and you live on it.
Tennancy of a croft is where you buy the right to lease from the landowner, often a local Laird. Annual rent is usually buttons, £15 a year or so. The lease has heirloom rights and can be handed down through the family.
Usually the part the house is built on is de-crofted. Simply means that is no longer crofted land and is like any other house site.
The most important part is that you should use the croft for a genuine crofting activity. cattle, sheep, veg, hay, whatever. As long as you can show it is/will be used and not left to become overgrown.
If you do not use the croft for crofting activities the tennancy can be taken from you and the croft let to someone else. Or a tennant can sub-let to someone who will use it.Starting to happen a bit more than it used to.
If it is owner Occ. and you are not using it you can be forced to let the land to someone who will use it correctly.
In a nutshell, that's it. I suppose the phrase should be "Use it or Lose it"
Rgds
Sskye
NB - To those many who are crofters, I know there's a lot more to it and I try to take all the info. from my SCF news letters but, for someone with no knowledge of crofting I hope this throws a little light on the subject....it ain't frightening