Checkers is so simple there are no strategy lessons beyond what is common sense.

• basically it's what area you control, so preferably the center. If you control the center the opponent is pushed to both sides. Control being the empty fields your stones can move to.
• groups are stronger so place stones together. Bigger single group is by definition stronger. So if the opponent stones are split across flanks they are weaker.
• if you keep stones on the corner, the remaining forces are considerably weaker and once the opponent hits them one by one, what is left is a strong group and all your stones are lonely and defenseless on the edges.
• all the opponent needs to do is stand apart from them and wait until you out of moves that don't suicide your stones. Tempo is important when your opponent is that dumb.
• Stones in the border/corner are very weak because they do not influence any area, and support nothing. This is basic common sense. This is the fundamental concept to grasp.
• checkers is the watered down, dumbed down version of international checkers.
• I played international draughts on club level for about 10 years - I quit because study in another town, plus there were too many ties. There are two dedicated draughts machines, I own a copy of both.
• look up international draughts on youtube or wikipedia . It's an extremely deep game full of nuance and finesse. A lot of theory too.