Well, first, you could check out online manga libraries. Make sure they have the official license. Another option is to buy physical copies from bookstores or online stores. That way, you can read at your own pace and build your collection.
I wouldn't recommend looking for free, unauthorized sources. It's illegal and doesn't support the creators. You can check out official platforms or libraries that might have it available for a reasonable subscription or rental fee.
It's hard to give an exact measure. The progress varies depending on the latest chapters released. But you can check reliable manga platforms or fan communities for the most up-to-date info.
Overall, My Hero Academia's anime adaptation is reasonably faithful to the manga. There are some minor differences for animation purposes, but the core elements remain intact. Some episodes might expand on certain scenes or add a bit of extra dialogue, but it doesn't stray far from the manga's story.
It's hard to give an exact number. The number of My Hero Academia manga keeps changing as new volumes are released. Your best bet is to look it up on official manga platforms or dedicated fan sites.
Well, the My Hero Academia manga has been published since 2014 and is still going strong. It's accumulated a substantial amount of content over the years, but the exact length keeps changing as new chapters come out.