Re: Starting the Car.
If possible, anyone not using their car for long periods should drive it every few weeks long enough to get the engine warmed up. If this is not possible, then it should be driven forwards and backwards every now and then, even if it is only a car length.
This prevents flat spots from occurring on tyres that can take days or weeks to stop rumbling.
It also prevents flat spots on bearings if a car is stored for long periods, and stops oil and fuel seals etcetera from drying out and causing leaks.
If possible, leave the handbrake off when parked for long periods, especially if it was raining the last time the car was used and it has drum brakes. The shoes sometimes have a habit of sticking to the drum.
Alternatively, exercise the handbrake several times whilst running the engine and ideally moving the car about.
I have a classic car that doesn't get used very often, even without lockdowns. I discovered all the problems described above when we used to leave it in the garage untaxed for six months of the year.
I have a battery charger that is designed for people who don't use their vehicle very often such as a camper van in Winter.
It cycles the battery by slowly charging and discharging but never flattening it. This helps to prolong battery life, and they aren't very expensive.
Solar panel powered versions are available if a vehicle is to be left in an area without mains power.
Any decent trickle charger should work if you can't keep the type above permanently connected. Do check the handbook first, especially if jump starting, as it can blow electrical components or sensors due to a sudden high charge.
Again, I found this out the hard way when jump-starting a car that caused an air intake sensor to blow.
Modern cars may not suffer this problem, but it is always best to check.
The problems I have described are extremes and may not be a problem, but it won't hurt to go through a car exercise routine every now and then.
Don't forget, even if a car isn't being used, you should still do tyre pressure and fluid level checks as normally recommended.