One thing you should know is that there are a LOT of ~fancy frameworks~ out there which are designed for this or that functionality which is actually 100% possible in standard basic javascript as well - usually not even that much harder to implement (sometimes even easier), and in almost every one of these cases, the "basic javascript" version will perform MUCH more resource-efficiently. The website vanilla-js.com/ exists to demonstrate this.
The reason is that Javascript (or technically ECMAScript) is an evolving standard which did not support these features when many of these frameworks were first created, but nowadays are supported by all major browsers (yes, even Internet Exploder.)
Only use a framework when you actually need it.
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One thing you should know is that there are a LOT of ~fancy frameworks~ out there which are designed for this or that functionality which is actually 100% possible in standard basic javascript as well - usually not even that much harder to implement (sometimes even easier), and in almost every one of these cases, the "basic javascript" version will perform MUCH more resource-efficiently. The website vanilla-js.com/ exists to demonstrate this.
The reason is that Javascript (or technically ECMAScript) is an evolving standard which did not support these features when many of these frameworks were first created, but nowadays are supported by all major browsers (yes, even Internet Exploder.)
Only use a framework when you actually need it.