Whenever you are walking your dog on a leash, do not tighten the leash, since it can hurt your dog.
Aside from that, it can also make him pull you as a counter response, which is not good.
Keep his leash loose, so that he can enjoy the walk more, and would look forward to it day by day.
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Do not punish your dog whenever he fails to follow your command
There may be times when you feel that your dog is testing your patience by not following your command during a training session.
However, you need to remember that dogs always want to please their masters.
In other words, you simply need to spend more time in teaching him about the command, for him to follow it. Do not punish him, since it would just confuse him more.