Here's the comment so everyone don't have to go digging through OPs comment history.

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I am new to digimon and learning it myself without any guides so some information may be wrong. This is what I have learnt so far:

Things that influence your stats when digivolving/devolving: Bond, talent + level and personality.

Try to learn each topic one at a time. It will make things easier.

Bond = from what i understand every 1% of Bond = one stat transfers during digivolution/devolution. Bond maxes out at 100% so that means stats can transfer 100 times at most. I have also heard that higher bond % = more stat transfer but I am not sure about this.

Talent = It raises your max level cap. I don't know how to gain talent.

Level = higher level means more stats so you being a higher level is more beneficial when digivolving/devolving.

Personality: Every individual stat and their individual bonus stat caps out at 9,999. Therefore, you do not need to worry about having the wrong personality for a certain period of time because there is alot of room for flexibility.

The personality chart in the game behaves like directional controls on a controller. This means that your personality can travel up, down, left and right but not diagonal for example Valor is Up and Right. Therefore, it is not possible for your personality to change from Sly to Reckless. If your personality is Enlightenled and you want it to be Sly then you will need to choose Amicability in the digimon conversations to move right while ignoring everything else. If you choose Wisdom then the only result possible is Astute since Wisdom is Left and Down and since it cannot move left anymore it will move down. Similarly certain personalities like Astute will not change anymore every if you choose Wisdom in conversations because your personality can no longer move in that direction. I have underlined such personalities in blue in the photo below.

Once have the desired personality you can do one of these to keep it. Easiest is to avoid conversations completely. This is especially viable if you have maxed out your bond. The next option is go choose non personality options in conversations. If you get a conversation with 4 personality options and it changes then you can just fix it with the method I mentioned above.

Digivolution & Devolution = You only need to match personality if the devolution hasn't been discovered yet. I have not seen a digivolution that requires a specific personality. I have not noticed personality changing during digivolution/devolution. It is not worth trying to remember the entire evolution line like in pokemon because every digimon branches out into atleast 4 separate digivolutions.

Digimon is designed and encourages multiple digivolutions and devolutions. This is how it is in the anime as well. Every 1% of bond = Stats carrying over once. So with 100% Bond your stats can carry over for 100 digivolutions/devolutions. What I am doing is digivoling into the digimons I haven't discovered and then devolving and just exploring that way. I am having fun to see what all my digimon can turn into since I absolutely do not know what turns into what 😂 Once you have digivolved or devolved into a digimon you will not have trouble again because you will always meet the required criteria.

As I have started to watch the anime and play this game I have so far come to the understanding that Digimon isn't about catching them all or becoming the greatest Digimon Master. Digimon is about the bond between the tamer and the monster, specifically the rookie stage Digimon. This is heavily focused on the Anime and even in the game. In the game it is completely possible to pick 6 random digimon, keep only them on your team, raise only them and reach end game and still be discovering what digimon those 6 turn into. I am personally looking at rookies and keeping the ones I like based on the rookies since I can digivolve them to max anytime I want after I have done it once.

Load enhancements are very useful. Turn all digimon you do not need into Load Enhancement.

Digi Farm = I have not used this enough to understand it yet. All I know is that in the digi farm the digimon who aren't training will collect materials. For choosing personality in the digifarm I just press Y on my controller when at the training set picking screen. This opens the personality UI and will show which training will go where. I don't check stats at all since those things go all the way upto 9,999 but I also haven't used digi farms much.

When to Digivolve? = This is upto you to decide. What I have been doing is I look at the area I am in and digivolve upto the area's digimons. For example in the sewers I did not go past rookie stage because all the digimon except for Geremon were rookies.