Somehow missed this, Vlad, sorry. Here’s what I think are the most crucial. (Also yes, this is iOS - keyboard shortcuts should work across iOS. Using a keyboard with an iPhone is an edge case, but consistency is good.)
Cmd+L - focus address bar
Shift+cmd+[ - previous tab
Shift+cmd+] - next tab
Command+left arrow or command+[ - previous page
Command+right arrow or command+ ] - next page
Command+ R - Reload page
Command + W - Close tab
Shift + cmd + t - Reopen last closed tab/window
Shift + cmd + r - Open Reader mode
Cmd+number would be great to move between tabs, but not crucial for the first release.
Command + - (minus) or Command + + (plus) - decrease/increase text size
Command + 0 (zero) - reset text to 100%