Questions about broad niches

Hello,
A month ago I opened a blog with a fairly broad niche.
Let's say for the sake of the argument, I have a blog about "cars".
That's a pretty broad niche, right?
Okay, so, I have different categories, let's say, car repair, car painting, car insurance, car financing. Apart from these, I have some not so close related categories, let's say cheap places where to go driving, drive thru shops etc.
I know it is almost impossible to rank good for these categories, but I plan to find the lowest competition and lowest volume keywords for every category.
Is it okay? I mean, is there any problem with this? Do I have any chance ranking good? Can I make any good money with this strategy?
Also, I see people asking what's your main keyword. I don't even have a main keyword. Yeah I know thay in the type of blog I mentioned above the main keyword is "car" but my real type of blog doesn't have a keyword that I am going to mention in almost every article. Is there any problem with this?

If you are making big website, then you should not worry much about your main keyword. However you should keep finding out long tail keywords which will be easier to rank and you will drive quite a lot of traffic from long tail keywords. It will depend on how big you want to make. On the other side, if you want to make narrow website (niche), then defining main keyword will make sense as you need to optimize the homepage accordingly

I do not know how big it will get but I want to create many, many posts with low volume long tail keywords to get low traffic from each post but to scale it with the number of posts. That's my strategy.

EddieN said:

Is it okay?

Click to expand...

In short - yes. You can easily rank your pages for long-tail keywords. You don't need to rank for your primary keyword like 'car', just conduct in-depth keyword research to find low-competition keywords that still have some search volume.

*relief sighs*
Thank you