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The simulations I tried were Bouncy maps – https://www.bouncymaps.com/#!/bouncymaps/WORLD/1147138151 and Phet http://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-basics_en.html. I feel that they have a really easy and efficient user interface as you can play around on the web itself, certain other simulations require you to download/embed one. The Phet one is a little tough to get your head around but as I have used it in physics lessons, I found it easier. For a beginner, I would recommend playing around with the modifiable variables to understand any concept. Using the play/pause/slow motion options gives the users a chance to improve their understanding and concepts. The second one I used was the Bouncy map, it was weird that a normal map acts as the default page rather than the bouncy map. That is either to emphasize how effective a bouncy map could be. It is easy to work with, the zooming in and out can go a little out of control but changing the variables and reading data is really easy.

These simulations improve your understanding but might convey misinformation or a misinterpretation of certain concepts as they are animated. But these can limit your critical thinking or your visualizing skills. And also simulations can either miss out on the exceptional features (anomalies) in certain concepts or might be outdated. These simulations are good as a supporting source in research or teaching, but you can’t depend on them, they are models and simulations to improvise your understanding only. They cannot replace real-life demonstrations.

One of the other interesting simulations is Desmos, which is usually used to graph equations and helps a lot to visualize complex graphs during maths lessons, they are easy to use and provide you with all mathematical symbols and expressions https://www.desmos.com/calculator.