1. Could you please tell me what the difference is between these two locations in the hooks element section:
‘wp_head’ – and ‘before header content’.

2. The first block of the google tag manager code is supposed to go into the ‘wp_head’ section, and the second block into the ‘before header’ section. However I saw in google tag manager that this second block is supposed to go right after the opening <body> tag. So now I am not clear what exactly the best placement for it is.
3. Is the ‘wp_head’ the same as the ‘header’, or is this a different thing?