At minimum, unplug everything when not in use or when a storm is imminent.
For a little cost, purchase some surge protectors for both mains and telephone connections.
And finally for a good all round protection, purchase a good UPS with surge protection
I personally use, and have done for many years, UPS from APC. These have proven to
me to be exceptionally good and reliable. Currently I have a number of the APC Back-UPS
ES 700VA 230V which have been protecting my systems. They are also a nice small unit
that can easily sit under a desk or somewhere discrete - but note: do not box them
in as they need general air flow (don’t we all in the hot weather !)