There are a lot of important informations for beginners who want to learn English. However, the most important thing here is related to the verbs: it's the important element of a phrase, it shows what we are saying. If you don't know the difference between two similar words, like 'walk' and 'stroll', you can't understand what the person is talking: maybe, he or she wanted to show a nuance (shade) of meaning. So, the important information here is to use correctly the verbs.