You can hit them by pointing your cursor and holding the mouse button until it breaks. Some things require certain tools that you need to craft in order to break. For example, obsidian blocks can only be broken (mined) with a diamond pickaxe.
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You can't you can only break.
you cannot break bedrock in minecraft it is not possible
No.
It is called Minecraft because the primary things you do in Minecraft is, well, mine and craft.
No, though one of the key things about Minecraft is that you learn to teach yourself things... but if all else fails you can check the Minecraft Wiki.