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I'm here to learn, so advice is appreciated.

Since moving over the Stretch, by selecting wifi from the menubar it seemed to populate the tail of my /etc/dhcpdc.conf with:

SSID <my AP> inform 10.0.1.10 static routers=10.0.1.1 static domain_name_servers=8.8.8.8

My RPi didn't seem to like it. It connected, but there were other issues. When I replaced that format with the following, from a Jesse Pi, it behaved as I expected.

interface wlan0 static ip_address=10.0.1.10/24 static routers=10.0.1.1 static domain_name_servers=8.8.8.8 8.8.4.4

Can someone explain the differences of the two, or point me to a tutorial, so a newbie like me can better understand Pi networking?

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    man dhcpcd.conf should explain the options; inform is in this: daemon-systems.org/man/dhcpcd.conf.5.html Prefer the system man page if they conflict. – goldilocks♦ Jan 17 '19 at 21:27
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    BTW: AFAIK SSID/inform and interface/static are not linked pairs. SSID/static, etc is also possible. I have used interface/inform and it worked. – Dirk Jan 17 '19 at 22:40
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This is what man dhcpcd.conf tells

inform [...] sends a DHCP INFORM instead of DISCOVER/REQUEST. This does not get a lease as such, just notifies the DHCP server of the address in use. You should also include the optional cidr network number[...]

If you set static ip_address then dhcpcd will not attempt to obtain a lease and just use the value for the address with an infinite lease time. [...]

For IPv4, you should use the inform ipaddress option instead of setting a static address.

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