The Swedish state-run media puts out a very good comparison between all the parties each election year which I use to understand what position each party has. It’s been generally easy to figure out which party is closest to me using that tool. It can be used for the three tiers of elections that we have in Sweden.

Other than that I try to look at polls to see whether it would be generally better for me to place a strategic vote on a party that is not my first choice.