You can acknowledge others in many ways. When someone calls you, acknowledge the call. When they send you something, remember to say thank you. When someone does a good job, say so. When they apologize, acknowledge that too.
It's especially important to acknowledge acts of kindness – doing so reinforces the act and encourages more of the same. We all benefit.
Almost everyone loves to be acknowledged. We love to have our phone calls returned, to be told we are doing a great job, to be thanked for working so hard, to have our creativity appreciated.
People remember acknowledgment and they appreciate it. When you need a favor, or advice, the fact that you have previously taken the time to acknowledge someone often comes back to help you. It makes others want to help you and to see you succeed.
Also, people who have been acknowledged genuinely and with love are very forgiving. They will see
beyond your mistakes and failures and forgive you freely. Needless to say, all of this makes your life easier and far less stressful.