This is clearly advice for civilian people who intend to fight in any case. There is obviously a threat to life here, so each person is empowered to make decisions based on this knowledge. I would add to defensive strategy:

1. Communications - Ideally a radio, or visual (i.e. hand signals). This way you can ask for help, supplies, or warn people of an oncoming threat. The better your communication, the better you can coordinate your efforts.

2. Choke points - Not just for vehicles, but also for personnel. Ideally you would have some advantage over the choke points, such as height. You are unlikely to have a long-distance advantage over a trained soldier.

3. Disable infrastructure - As the thread suggests, bridges, roads, trains, paths - anything you find useful, your enemy also finds useful.

4. Identification - Ideally you need to be able to quickly identify one another, and potentially somebody who is not one of you.

For offence strategy:

1. Petrol + <censored> (search engine) - It is possible to make a highly flammable substance that sticks to anything it touches. This is highly effective against personnel.

2. Burning barricade - For pathways or alleyways that cannot be easily blocked off, start a large tire fire. This location will essentially be unpassable until the fire is extinguished. Tire and oil fires are notoriously difficult to put out.

3. Sabotage - Sabotage resources the enemy may want or need (but make sure your allies are aware of this). Food/water can be poisoned, fuel can be contaminated.

4. Weapons - Don't waste time aiming too much. Fire in the location of the enemy and move location. A single shot, then move to a random location. The goal is to make them take cover and remain in cover. If you can, coordinate it such that as one person/groups moves, the others provide covering fire. You will need a lot of ammunition, even if you are highly conserving it.

Tactics to be aware of:

1. Flanking - If you are successfully holding an enemy in a location, they or other support are likely trying to flank your position. Know all entry points to your location in advance and have exit routes planned.

2. Large weapons - If you have an enemy held in a location and they are not able to flank you, the other option is using a large weapon. This could be a tank, launcher, air support, shelling, etc. Ideally you retreat before this happens.

General points:

1. Food/water - You will not operate for long without these. At least 2 litres of water a day and at least 2000 kcal a day. Ideally 4 litres of water and 4000 kcal.

2. Sanitation - You need to maintain basic hygiene. Disease will make you ineffective incredibly quickly. Shit when you need to, a common mistake is to wait for days for a toilet to be available.

3. Medical supplies - Ideally you have some medical supplies on hand. Most likely injury is to be shot or hit with shrapnel, most penetration wounds will not kill you. Blood loss is your greatest immediate concern to deal with.

4. Morale - Make sure people are paired up at least - long periods of solitude are awful for mental well-being. Be prepared for nothing to happen for a long time, then lots to happen all of a sudden. Maintain alertness and always assume the enemy is watching.

Best of luck to you all.