Learn Spanish (Latin America): No lo ignore, el guardia es estricto.

This is a formal usted command. To give a negative command to someone you address as usted, take the verb ignorar, drop the -ar, and add -e to make no ignore. If you were talking to a friend (tú), you would say no ignores.

Why does lo go before the verb here?

Because this is a negative command. In negative commands, object pronouns like lo (him) must always go between the no and the verb. If it were a positive command, the pronoun would be attached to the end of the verb, like ignórelo.

Wait, shouldn't words ending in -a like guardia be feminine?

Usually yes, but guardia is a word where the grammatical gender matches the person's actual gender. Since we are talking about a male guard, we use el guardia. If the guard were female, it would be la guardia.

Why use es instead of está for being strict?

We use es (from the verb ser) because being strict is treated as a core characteristic or personality trait of this particular guard, rather than a temporary mood or condition.