What are some tips/pointers to follow to have the best experiment design possible?

In order to have a great experiment and great data for analyzing you must have the best experiment design possible.Experiment design is the process of organizing the experiment properly to ensure that the right type and amount of data are available to answer the questions of interest. Some of the tips to follow in order to have good experimental design are:
-Choose a topic that will interest and challenge you.Do not pick a broad topic.
- Spend a lot of time gathering background research.
- Predict  the outcome of your experiment with the help of equation.
-Keep a detailed and up-to-date lab notebook with the results.
- Do as many trials as possible .
- During the experiment, do not get discouraged if you run into a lot of problems..