Theory:

1. A bird in hand is better than two in the bush.
Meaning: It is better to hold on to something that you have, rather than waiting for something that may or may not reach you.
 
2. A chain is only as strong as its weakest link.
Even if one part of a chain is weak, it makes the whole chain weak. Anytime the weak link can wear off, and therefore weak link only decides the strength of the chain.
 
3. Actions speak louder than words.
It is easier to say, but difficult to put in action. Actions provide more credibility than words.
 
4. A fool and his money are soon parted.
Only wise people know how to handle their money.
 
5. A journey of thousand miles begins with a single step.
The journey of life can be long and strenuous but taking the single first step is important. Many single steps add up to the whole journey.
 
6. A leopard can’t change its spots.
The basic character of a person cannot change even if tried.
 
7. All good things come to an end.
All happenings in life will come to an end, eventually. Life is full of ups and downs.
 
8. All’s well that ends well.
As long as the outcome is good, problems on the way don’t matter.
One may face many difficulties to solve a task - but in the end if the outcome is good, the difficulties will not matter. In the end, all is well.
 
9. All that glitters is not gold.
Do not go by the looks of any person. Even if anything looks good outwardly, the inner qualities must also be examined to know the real character. Just because it glitters, it is not gold, it can be artificial.
 
10. Always put your best foot forward.
Try to put in the best efforts and play to your advantage. Show/apply your best skills first.
 
11. An empty vessel makes more noise.
When empty vessels are rolled, it gives more noise than when a fully loaded vessel is rolled. Similarly, if our brains are loaded with good values and knowledge, we tend to speak less and work more.
 
12. An idle brain is the devil’s workshop.
If we keep our brain idle, it will gather unnecessary and negative thoughts. Keeping ourselves busy will keep us healthy.
 
13. An ounce of protection is worth a pound of cure.
Preventive measures are easier than finding a cure for the problem. Prevention of the problem saves time and energy.
 
14. A picture is worth a thousand words.
It is easier to explain with a picture than with words, as pictures are attractive, unique and easier to remember than chunky texts.
 
15. A ship in the harbor is safe, but that is not what a ship is for.
Harboring the ship is safe, easy and no risks are involved. Only if the ship sails, the purpose is attained. Staying in the comfort zone will not help us. Stepping out and moving into the real world will help us attain our goals.
 
16. As you sow, so you shall reap.
Whatever seeds you sow, you will yield the same. Similarly whatever you do, comes back to you - either good or bad.
 
17. A thing begun is half done.
A good beginning is the most important part of a task. Proper beginning paves way for the easy accomplishment of the task.
 
18. Beauty is in the eye of the beholder.
The person who sees the thing should decide whether it is beautiful or not. What makes one sick, can make the other healthy.
 
19. Beauty is only skin deep.
The character of a person is more important than his physical beauty.
 
20. Beggars can’t be choosers.
If you are dependent on others for your needs, you cannot have the options to pick what you want. You can only accept what is offered to you, whether you like it or not.
 
21. Better late than never.
It is better to finish our task, even if delayed than not finishing at all.
 
22. Health is Wealth.
If one is in good health, he can earn wealth anytime. But if health is not good, he cannot earn well. It is better to be healthy than wealthy.
 
23. Cleanliness is next to Godliness.
Cleanliness is close to Godliness. By keeping ourselves and surroundings clean, we can attain great things in life.
 
24. Don’t bite off more than you can chew.
If we bite a bigger piece than we can chew, we will choke. Similarly, take up only the tasks and responsibilities that you can handle.
Example: I bit off more than I can chew when I said ‘yes’ to my boss for another project.
 
25. Don’t count your chickens before they hatch.
Don’t expect gains based on future events that may or may not happen.
 
Important!
Study more such proverbs here.