l_t's response was very good, I would recommend what he has to say.
To follow-up... essentially, yes. A text editor and a <script> tag is one way to approach it, though I would advise that you stick with making something small. One-off, toy SPA's are a great way to get to know JS. (Here's a challenge: TodoMVC sans frameworks ==evil grin==) With big ideas it is a lot harder to do this with big ideas until you have a firm layout of the code in your head.
In fact, this may go against a lot of recommendations but I'd recommend getting comfortable with ES5 before moving to ES6. A lot of existing code is written to ES5 standard and, while ES5 is certainly missing LOTS of important goodies, there is more than enough language to do most kinds of data-processing. (Though don't feel bad if you find yourself building a util.js with a bunch of string manipulation functions, for example, or find yourself importing jquery... I consider JQ to be an exception to the 'no tooling' rule, because classic JS DOM manip really, really sucks). Things like callback hell are important to understand, even if you never intend to write in that style.
To follow-up... essentially, yes. A text editor and a <script> tag is one way to approach it, though I would advise that you stick with making something small. One-off, toy SPA's are a great way to get to know JS. (Here's a challenge: TodoMVC sans frameworks ==evil grin==) With big ideas it is a lot harder to do this with big ideas until you have a firm layout of the code in your head.
In fact, this may go against a lot of recommendations but I'd recommend getting comfortable with ES5 before moving to ES6. A lot of existing code is written to ES5 standard and, while ES5 is certainly missing LOTS of important goodies, there is more than enough language to do most kinds of data-processing. (Though don't feel bad if you find yourself building a util.js with a bunch of string manipulation functions, for example, or find yourself importing jquery... I consider JQ to be an exception to the 'no tooling' rule, because classic JS DOM manip really, really sucks). Things like callback hell are important to understand, even if you never intend to write in that style.