I'm never going to use this for my commercial projects.
I'm going to use these for friends and family, who keeps asking me to "please, build me a website."
I like to help a team of developers doing something different and earning money. Best of Luck. Bought one license.
Once you get more experience, TailwindCSS can be good way to go. (tailwindcss.com)
Mind you my focus here is less on learning the more current tech and methodologies and more learning by getting something done early.
The worst thing is that it looks like Bootstrap :P
You should use something like Material Design for Bootstrap right away.
Especially with the latest v5 version with plain JS (na jQuery)
Anyway, use what you feel comfortable with. Personally, I work with both TailwindCSS and Bootstrap at the same time.