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Upgrade FreeBSD ports with portsnap, pkg_version, and portupgrade
Upgrade FreeBSD ports and packages        
Historically, upgrading the FreeBSD ports collection has been both time consuming and error prone.
Nowadays (FreeBSD 11.0 at the time of writing), the pkg package management system is the preferred (and fastest) way to upgrade the FreeBSD software.
Personally, I only use the ports collection when I need to hack the code for some software, for example:
cd /usr/ports/textproc/aspell
make
cd /usr/ports/textproc/aspell/work/aspell-0.60.6.1/common
<hack some code>
cd /usr/ports/textproc/aspell
make
< link static lib /usr/ports/textproc/aspell/work/stage/usr/local/lib/libaspell.a to your program>
Otherwise, I always use the pkg tool.

Links:
FreeBSD Handbook: Using pkg for Binary Package Management
FreeBSD Handbook: Using the ports collection
Last modified: Wed Sep 7 04:40:18 EDT 2016