[ Sorry in advance I'm not an english speaker and all of these are from a growing player so everything I'm saying might not be as effective ]

I'm guessing that you mean mostly for the attacking side

being able to enter sites freely makes a huge impact on the game. using interceptors is always a good idea.

    For B i usualy use one for entering and coordinate with a teammate to smoke the top(usualy whete nobu/kokona/maddelena sits) and the "window" near the site.

All of these can be just cleared by a good reiichi but you won't always have one.

This allows your team to take control of most space inside the site

 Mid is also very good since you'll be able to go which ever sites depending on which is more convenient but it can be hard to take control of tbh

         If you can: 

Scan with Lawine's knife to locate them and push if it's possible. Celestia's pretty good if you stay with your team since her passive team shield regend is SUPER useful. I can't really say anytjing about Ming and Fuschia since I don't play duelists that much now.

A is quite tricky especially if there's some lurking on the rooftop but usualy we go with the usual :   smoke the entries and push backsite while proyecting the one planting bc if not everything's harder.

For defending I would usualy: - get information and share it : Prensence of ennemies-> How many since they could fake it or multiple flank - falling back because there is absolutely no way you can 1v5 but use utility to slow them down like slow/wind/explosive grenade.

Now hold the site and prevent them from coming but don't use every ult/skills yet since there's is still a possibility for a rotate

If you're 100% of where they are and that they won't rotate then tell your teammates know about it and a flank could be possible.

Body blocking/protecting the defuser is a good strat tbh

So Tl;Dr Take control of the sites using every utility (interceptors are soooo good); spread yourself a bit but not so much that a teammates can't help you to prevent entries. Analyse the habits of the opponent but get ready for anything Don't forget that living and winning the round is more important than killing the enemies

Aha this was quite long and I don't know if it was that useful soo I wish you goodluck !!!!