So many ways to go to first buffer...
- key Alt+1
- key Alt+j, then 0, then 1
- key F5 *
- key F6 *
- key Ctrl+p *
- key Ctrl+n *
- key Alt+Left *
- key Alt+Right *
- key Alt+Up *
- key Alt+Down *
- key Alt+a (if buffer #1 is first in hotlist)
- left mouse button with long gesture to the left (with mouse enabled)
/buffer core.weechat(if core buffer is #1)
/buffer close 2-99999(joke! - this will destroy all buffers and keep only buffer(s) with number 1)
/buffer move 1(joke! - current buffer will become #1)
There are other ways with scripts, but it's cheating!
* : press key many times until you reach buffer #1.