Wall Switch doesn't work.

Hi, as I confessed on another post, I changed switches and outlets without marking wires. I know, I know....

I just bought this house and don't know what the switches activate. On one switch, I think I found the outlet which must be switched, 3-wire sheathed electrical cable pigtailed etc. I connected the wire coming off the pigtail to the hot side of the outlet and the whites to the neutral side and broke the tab on the hot side. All I did was kill half the outlet. The load side outlets still have power but the switch does nothing. Any ideas what I might try?

On the other switches, I have no clue what they do. No other plug has more than a line in and line out configuration. How would an electrician approach deducing what these switches do? btw, the switches in question are single pole and mounted in the same box.

Thanks! Ed