It could be as big as getting married to the wrong person or as small as the lens you view yourself. Some decisions will end up hurting for a long time. Don't play red light/green light with your future. Instead, look for these yellow lights and choose carefully.
Life is filled with decisions large and small. Careers, love interests, marriage, health, and having children or not are all choices we make that have significant impacts on our lives and those we love. Know what decisions will have the most impact so you don't get caught off guard.