I receive requests from people who are learning how geocache and are looking for some pointers.
The thing that I like to emphasize is that you are part of a community and what you do affects what people think of you. It's a bit like being a tradesman. People don't care if you're a nice person or not, they appreciate high quality work which leads to having a good experience. They are tuned into their own personal radio station WII-FM (What's In It For Me). So the quality of your work reflects who you are.
This applies to placing caches, writing logs and the care of trackables (travel bugs, gecoins etc.)
You can find tips about how to hide and find geocaches in other posts, but the important thing is to be a good geocacher and contribute to the community. If you don't people may think you're an idiot and you'll develop a poor reputation. On the other hand, if you follow these simple suggestions and take a little more care, you will be well regarded.
So the mantra is: QUALITY, QUALITY, QUALITY in everything that you do.
This is probably the best tip that I can give you.