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Sure, there's not much, but if you'd rather listen than read, then here you go.

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There are two kinds or primary productivity. Gross Primary Productivity (GPP) and Net Primary Productivity (NPP). Gross Primary Productivity is how much is produced in total. Net Primary Productivity is how much is left for the next trophic level.

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Primary productivity is the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances.

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This is why food webs are generally more accurate than food chains.

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More detailed explanation on energy flow.

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As you go up through the trophic levels, 90% of the energy gets lost. For every 10 kcal a tertiary consumer eats, the producers have to make 10,000. This energy is lost through heat and egested waste. Only the energy stored in the biomass (Fat, muscle) will get transferred to the next organism.

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Vegetarians are primary consumers, meat eaters are secondary or tertiary.

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Some organisms can be part of two or more trophic levels. Example: Humans

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Meandering River: Plants / Detritus (Producer) > Smaller Fish (Primary Consumer) > Larger Fish (Secondary Consumer) > Large Bird (Tertiary Consumer)

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Reason behind this is because of energy flow between producers and consumers.

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In an ecosystem, there generally are more producers than there are primary consumers, then more primary consumers than secondary, then secondary over tertiary.

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Visual representation of calorie transfer through the different levels. These are called Trophic Levels.