Tips for trains in France

https://parisbytrain.com/ Website is very helpful for the metro Paris transit system. It includes photos and explains the system quite well.

This site provides all you need to know
https://www.seat61.com/train-travel-in-france.htm

Are you planning a day trip to MSM???
Ugh

Keep your passport and credit cards and large amounts of cash in a money belt

Keep daily small amount of cash and 1 card accessible -zippered front pocket or deep in a crossbody bag

Pay attention to your surroundings

I agree with the suggestion for a taxi. The rate is 56€ to any location on on the Right Bank and 65€ to any location on the Left Bank. Just follow the signs and the footsteps painted on the floor to the official taxi stand. Do not go with anyone who approaches you.
For the trip to Montmartre, you can get routing using the RATP or CityMapper apps. Secure your valuables to deal with pickpockets no matter what metro line you are on but it is especially important on Line 1 and Line 4 IMO. If you are doing a day trip to Mont St Michel, I suggest using a tour from Paris and not dealing with the trains. It's a very long day trip.

In addition to KD's good advice regarding theft and pickpockets. pay attention to your surroundings. There are things I can get away with at home that I certainly wouldn't do traveling in Europe and other places.

Always keep your valuables secure when out and about. Don't leave a purse or bag hanging over the back of a chair. Don't set your phone on the table. Keep it tucked away. Don't leave your day bag sitting under the table or on a bench.

Add your debit and credit cards to your Apple or Google wallet. Even if you don't use your phone to pay, most banks can immediately update your Apple/Google wallet with your new card in the event that your physical card has been lost/stolen or reported as fraud. This way you will still have immediate access to your cards

Have a great time and enjoy your trip!

If you read the OP's posting history, you might learn that this is not their first rodeo.

Thank you everyone I really appreciate all the insight and the ease of mind.

@sam yes this isn’t my first rodeo but I alway like inquiring bc I always learn something new like adding my cards to my phone. That’s a very valuable tip in case of emergency!

I appreciate you all!

The app i have found most useful in Paris is Citymapper. It very specifically tells you what train, or bus to use, where to pick it up, and even where to stand on the conveyance so that you are closest to your required metro exit. This is handy as many stations have multiple entrance/exits.

I have never had a problem with pickpockets in multiple trips to Paris every year.

If your planned trips will be the only times you'll use the trains, don't buy a day pass; go point to point. You need 8-10 trips daily to make a day pass worthwhile. Also, don't try to buy a train pass at CDG, just get to the hotel and then go to the closest station and get your navigo card there and load it. That will save you an hour of standing in line.

Citymapper, okay I will absolutely download that,

So the consensus here is to take the taxi and avoid to train to get to our hotel?

Is that because of my general anxiety or just an easier method of transportation?

Hello
Having done both taxi and train to my hotel in Paris (RER B train) , I find it much easier to take a taxi. It is worth the extra euros. Like others said- go to Official Taxi Rank (line)- have your hotel address written on a piece of paper including zip code (arrondissement) and hand to driver. Confirm they take credit cards before getting into taxi. No need to tip its flat rate. Many will approach you inside airport just keep walking say no and ignore them. Taxi to your hotel makes things start off right. Worth every euro.
Pickpockets are in every city around the world- in Paris on the metro they work in teams and sometimes are kids/teenagers and one will try to distract you while the others rob you- dont let them. Try to get a seat or put your back against the door. Sometimes they try to put on a show play music just ignore. Hold your phone tight keep valuables close. Make photocopies of your passport any cards you bring your id keep in luggage or secure place as backup.
Dont act like your scared or worried act like you take the metro every day and you will be fine. Public transit is amazing in Paris and there are buses you can take as well. Citymapper great app- ratp and sncf as well. Im taking a train right from CDG to Rennes and staying there a few days to visit Mont St Michel- bus from Rennes goes right to the Mont tourism office then free shuttle to the Mont. Its much easier than a day trip from Paris (long day) but day trips can be done. Lots of videos on youtube you can watch- Les Frenchies a good channel along with Ricks.
Enjoy your trip!

People grab phones and run, so don't sit near the door of the Metro car with your phone out, or leave your phone on the table at an outdoor cafe.

I've found https://pariswayout.com to very helpful in navigating the metro. It has detailed information about the different entrances and exits for the stations, which helps because some of the stations have 7 or 8 exits and you want to go out the correct one.

One very specific piece of advice I wlll offer re: Montmartre: while the Abbesses station has only one exit, that exit is FOUR STORIES above the train platform, and there is no elevator. Consider that when planning your trip to Montmartre.

Enjoy your visit!

Edited: We didn't notice the elevator at Abbesses, or more than likely just breezed on by it, not realizing the 4-story ordeal we were about to face. Next time we'll look for it! Thanks, Philip!

Abesses does have an elevator, maybe it wasn't working when you were there?

I would suggest paying attention to the electronic board. There are 2 of them both with cities and time indications. The blue board is what you should pay attention to after looking at the green board. When the train arrives, its arrival is indicated on the green board along with its track / platform. Your departure will normally be close to that track.

The French train system is easy to use, learn the terminology in French it helps. That's what I do.

I don't concern myself with getting picked by the bad guys /women in the Paris Metro....not interested.

It did happen this summer in the Anvers Metro stop. The 2 women boarded after they saw me get on, (that I noticed) , my being a most likely target with tourist written all over me but then , so what? Did they get to me, yes, one did, unzipped my waist belt on the crowded train. She got nothing, just as I expected. A pity, must be losing that touch.

The two got off at the next stop after Anvers, which shows their real intentions.